11 files changed, 1050 insertions, 0 deletions

diff --git a/layout/ipc/PRenderFrame.ipdl b/layout/ipc/PRenderFrame.ipdl
new file mode 100644
index 0000000000..3a1a47fe06
--- /dev/null
+++ b/layout/ipc/PRenderFrame.ipdl
@@ -0,0 +1,37 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*-
+ * vim: sw=2 ts=8 et :
+ */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+include protocol PBrowser;
+include protocol PLayerTransaction;
+
+
+using class nsRegion from "nsRegion.h";
+
+namespace mozilla {
+namespace layout {
+
+/**
+ * PRenderFrame (in the layout sense of "frame") represents one web
+ * "page".  It's used to graft content processes' layer trees into
+ * chrome's rendering path.  The lifetime of a PRenderFrame is tied to
+ * its PresShell in the child process.
+ *
+ * The child process conceptually "owns" a PRenderFrame, because it
+ * only makes sense wrt documents loaded by the child.
+ */
+sync protocol PRenderFrame
+{
+    manager PBrowser;
+
+parent:
+    async NotifyCompositorTransaction();
+
+    async __delete__();
+};
+
+} // namespace layout
+} // namespace mozilla
diff --git a/layout/ipc/PVsync.ipdl b/layout/ipc/PVsync.ipdl
new file mode 100644
index 0000000000..5d31e34d4c
--- /dev/null
+++ b/layout/ipc/PVsync.ipdl
@@ -0,0 +1,42 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+include protocol PBackground;
+
+using class mozilla::TimeStamp from "mozilla/TimeStamp.h";
+
+namespace mozilla {
+namespace layout {
+
+/*
+ * The PVsync is a sub-protocol in PBackground and it is used to notify
+ * the vsync event from chrome to content process. It also provides the
+ * interfaces for content to observe/unobserve vsync event notifications.
+ */
+async protocol PVsync
+{
+  manager PBackground;
+
+child:
+  // Send vsync event from chrome to content process.
+  async Notify(TimeStamp aVsyncTimestamp) compress;
+
+  // Send the vsync rate to the content process.
+  async VsyncRate(float aVsyncRate);
+
+parent:
+  // Content process use these messages to acquire the vsync event.
+  async Observe();
+  async Unobserve();
+  async RequestVsyncRate();
+
+  // This message is never sent. Each PVsync actor will stay alive as long as
+  // its PBackground manager.
+  async __delete__();
+};
+
+} // namespace layout
+} // namespace mozilla
+
diff --git a/layout/ipc/RenderFrameChild.cpp b/layout/ipc/RenderFrameChild.cpp
new file mode 100644
index 0000000000..72225abc09
--- /dev/null
+++ b/layout/ipc/RenderFrameChild.cpp
@@ -0,0 +1,35 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*-
+ * vim: sw=2 ts=8 et :
+ */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "RenderFrameChild.h"
+#include "mozilla/layers/LayerTransactionChild.h"
+
+using mozilla::layers::PLayerTransactionChild;
+using mozilla::layers::LayerTransactionChild;
+
+namespace mozilla {
+namespace layout {
+
+void
+RenderFrameChild::ActorDestroy(ActorDestroyReason why)
+{
+  mWasDestroyed = true;
+}
+
+void
+RenderFrameChild::Destroy()
+{
+  if (mWasDestroyed) {
+    return;
+  }
+
+  Send__delete__(this);
+  // WARNING: |this| is dead, hands off
+}
+
+} // namespace layout
+} // namespace mozilla
diff --git a/layout/ipc/RenderFrameChild.h b/layout/ipc/RenderFrameChild.h
new file mode 100644
index 0000000000..059f54a658
--- /dev/null
+++ b/layout/ipc/RenderFrameChild.h
@@ -0,0 +1,33 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*-
+ * vim: sw=2 ts=8 et :
+ */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef mozilla_dom_RenderFrameChild_h
+#define mozilla_dom_RenderFrameChild_h
+
+#include "mozilla/layout/PRenderFrameChild.h"
+
+namespace mozilla {
+namespace layout {
+
+class RenderFrameChild : public PRenderFrameChild
+{
+public:
+  RenderFrameChild() : mWasDestroyed(false) {}
+  virtual ~RenderFrameChild() {}
+
+  void ActorDestroy(ActorDestroyReason why) override;
+
+  void Destroy();
+
+private:
+  bool mWasDestroyed;
+};
+
+} // namespace layout
+} // namespace mozilla
+
+#endif  // mozilla_dom_RenderFrameChild_h
diff --git a/layout/ipc/RenderFrameParent.cpp b/layout/ipc/RenderFrameParent.cpp
new file mode 100644
index 0000000000..8162d02d79
--- /dev/null
+++ b/layout/ipc/RenderFrameParent.cpp
@@ -0,0 +1,368 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*-
+ * vim: sw=2 ts=8 et :
+ */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "base/basictypes.h"
+
+#include "BasicLayers.h"
+#include "gfxPrefs.h"
+#ifdef MOZ_ENABLE_D3D9_LAYER
+# include "LayerManagerD3D9.h"
+#endif //MOZ_ENABLE_D3D9_LAYER
+#include "mozilla/BrowserElementParent.h"
+#include "mozilla/EventForwards.h"  // for Modifiers
+#include "mozilla/dom/ContentChild.h"
+#include "mozilla/dom/ContentParent.h"
+#include "mozilla/dom/TabChild.h"
+#include "mozilla/dom/TabParent.h"
+#include "mozilla/layers/APZCTreeManager.h"
+#include "mozilla/layers/APZThreadUtils.h"
+#include "mozilla/layers/CompositorBridgeParent.h"
+#include "mozilla/layers/LayerTransactionParent.h"
+#include "nsContentUtils.h"
+#include "nsFocusManager.h"
+#include "nsFrameLoader.h"
+#include "nsIObserver.h"
+#include "nsStyleStructInlines.h"
+#include "nsSubDocumentFrame.h"
+#include "nsView.h"
+#include "nsViewportFrame.h"
+#include "RenderFrameParent.h"
+#include "mozilla/gfx/GPUProcessManager.h"
+#include "mozilla/layers/LayerManagerComposite.h"
+#include "mozilla/layers/CompositorBridgeChild.h"
+#include "ClientLayerManager.h"
+#include "FrameLayerBuilder.h"
+
+using namespace mozilla::dom;
+using namespace mozilla::gfx;
+using namespace mozilla::layers;
+
+namespace mozilla {
+namespace layout {
+
+typedef FrameMetrics::ViewID ViewID;
+
+/**
+ * Gets the layer-pixel offset of aContainerFrame's content rect top-left
+ * from the nearest display item reference frame (which we assume will be inducing
+ * a ContainerLayer).
+ */
+static nsIntPoint
+GetContentRectLayerOffset(nsIFrame* aContainerFrame, nsDisplayListBuilder* aBuilder)
+{
+  nscoord auPerDevPixel = aContainerFrame->PresContext()->AppUnitsPerDevPixel();
+
+  // Offset to the content rect in case we have borders or padding
+  // Note that aContainerFrame could be a reference frame itself, so
+  // we need to be careful here to ensure that we call ToReferenceFrame
+  // on aContainerFrame and not its parent.
+  nsPoint frameOffset = aBuilder->ToReferenceFrame(aContainerFrame) +
+    aContainerFrame->GetContentRectRelativeToSelf().TopLeft();
+
+  return frameOffset.ToNearestPixels(auPerDevPixel);
+}
+
+// Return true iff |aManager| is a "temporary layer manager".  They're
+// used for small software rendering tasks, like drawWindow.  That's
+// currently implemented by a BasicLayerManager without a backing
+// widget, and hence in non-retained mode.
+inline static bool
+IsTempLayerManager(LayerManager* aManager)
+{
+  return (mozilla::layers::LayersBackend::LAYERS_BASIC == aManager->GetBackendType() &&
+          !static_cast<BasicLayerManager*>(aManager)->IsRetained());
+}
+
+already_AddRefed<LayerManager>
+GetFrom(nsFrameLoader* aFrameLoader)
+{
+  nsIDocument* doc = aFrameLoader->GetOwnerDoc();
+  if (!doc) {
+    return nullptr;
+  }
+  return nsContentUtils::LayerManagerForDocument(doc);
+}
+
+RenderFrameParent::RenderFrameParent(nsFrameLoader* aFrameLoader, bool* aSuccess)
+  : mLayersId(0)
+  , mFrameLoader(aFrameLoader)
+  , mFrameLoaderDestroyed(false)
+  , mAsyncPanZoomEnabled(false)
+  , mInitted(false)
+{
+  mInitted = Init(aFrameLoader);
+  *aSuccess = mInitted;
+}
+
+RenderFrameParent::~RenderFrameParent()
+{}
+
+bool
+RenderFrameParent::Init(nsFrameLoader* aFrameLoader)
+{
+  if (mInitted || !aFrameLoader) {
+    return false;
+  }
+
+  mFrameLoader = aFrameLoader;
+
+  RefPtr<LayerManager> lm = GetFrom(mFrameLoader);
+
+  mAsyncPanZoomEnabled = lm && lm->AsyncPanZoomEnabled();
+
+  TabParent* browser = TabParent::GetFrom(mFrameLoader);
+  if (XRE_IsParentProcess()) {
+    // Our remote frame will push layers updates to the compositor,
+    // and we'll keep an indirect reference to that tree.
+    browser->Manager()->AsContentParent()->AllocateLayerTreeId(browser, &mLayersId);
+    if (lm && lm->AsClientLayerManager()) {
+      if (!lm->AsClientLayerManager()->GetRemoteRenderer()->SendNotifyChildCreated(mLayersId)) {
+        return false;
+      }
+    }
+  } else if (XRE_IsContentProcess()) {
+    ContentChild::GetSingleton()->SendAllocateLayerTreeId(browser->Manager()->ChildID(), browser->GetTabId(), &mLayersId);
+    if (!CompositorBridgeChild::Get()->SendNotifyChildCreated(mLayersId)) {
+      return false;
+    }
+  }
+
+  mInitted = true;
+  return true;
+}
+
+bool
+RenderFrameParent::IsInitted()
+{
+  return mInitted;
+}
+
+void
+RenderFrameParent::Destroy()
+{
+  mFrameLoaderDestroyed = true;
+}
+
+already_AddRefed<Layer>
+RenderFrameParent::BuildLayer(nsDisplayListBuilder* aBuilder,
+                              nsIFrame* aFrame,
+                              LayerManager* aManager,
+                              const nsIntRect& aVisibleRect,
+                              nsDisplayItem* aItem,
+                              const ContainerLayerParameters& aContainerParameters)
+{
+  MOZ_ASSERT(aFrame,
+             "makes no sense to have a shadow tree without a frame");
+  MOZ_ASSERT(!mContainer ||
+             IsTempLayerManager(aManager) ||
+             mContainer->Manager() == aManager,
+             "retaining manager changed out from under us ... HELP!");
+
+  if (IsTempLayerManager(aManager) ||
+      (mContainer && mContainer->Manager() != aManager)) {
+    // This can happen if aManager is a "temporary" manager, or if the
+    // widget's layer manager changed out from under us.  We need to
+    // FIXME handle the former case somehow, probably with an API to
+    // draw a manager's subtree.  The latter is bad bad bad, but the the
+    // MOZ_ASSERT() above will flag it.  Returning nullptr here will just
+    // cause the shadow subtree not to be rendered.
+    if (!aContainerParameters.mForEventsAndPluginsOnly) {
+      NS_WARNING("Remote iframe not rendered");
+    }
+    return nullptr;
+  }
+
+  uint64_t id = GetLayerTreeId();
+  if (!id) {
+    return nullptr;
+  }
+
+  RefPtr<Layer> layer =
+    (aManager->GetLayerBuilder()->GetLeafLayerFor(aBuilder, aItem));
+  if (!layer) {
+    layer = aManager->CreateRefLayer();
+  }
+  if (!layer) {
+    // Probably a temporary layer manager that doesn't know how to
+    // use ref layers.
+    return nullptr;
+  }
+  static_cast<RefLayer*>(layer.get())->SetReferentId(id);
+  nsIntPoint offset = GetContentRectLayerOffset(aFrame, aBuilder);
+  // We can only have an offset if we're a child of an inactive
+  // container, but our display item is LAYER_ACTIVE_FORCE which
+  // forces all layers above to be active.
+  MOZ_ASSERT(aContainerParameters.mOffset == nsIntPoint());
+  gfx::Matrix4x4 m = gfx::Matrix4x4::Translation(offset.x, offset.y, 0.0);
+  // Remote content can't be repainted by us, so we multiply down
+  // the resolution that our container expects onto our container.
+  m.PreScale(aContainerParameters.mXScale, aContainerParameters.mYScale, 1.0);
+  layer->SetBaseTransform(m);
+
+  return layer.forget();
+}
+
+void
+RenderFrameParent::OwnerContentChanged(nsIContent* aContent)
+{
+  MOZ_ASSERT(!mFrameLoader || mFrameLoader->GetOwnerContent() == aContent,
+             "Don't build new map if owner is same!");
+
+  RefPtr<LayerManager> lm = mFrameLoader ? GetFrom(mFrameLoader) : nullptr;
+  // Perhaps the document containing this frame currently has no presentation?
+  if (lm && lm->AsClientLayerManager()) {
+    lm->AsClientLayerManager()->GetRemoteRenderer()->SendAdoptChild(mLayersId);
+    FrameLayerBuilder::InvalidateAllLayers(lm);
+  }
+}
+
+void
+RenderFrameParent::ActorDestroy(ActorDestroyReason why)
+{
+  if (mLayersId != 0) {
+    if (XRE_IsParentProcess()) {
+      GPUProcessManager::Get()->UnmapLayerTreeId(mLayersId, OtherPid());
+    } else if (XRE_IsContentProcess()) {
+      ContentChild::GetSingleton()->SendDeallocateLayerTreeId(mLayersId);
+    }
+  }
+
+  mFrameLoader = nullptr;
+}
+
+bool
+RenderFrameParent::RecvNotifyCompositorTransaction()
+{
+  TriggerRepaint();
+  return true;
+}
+
+void
+RenderFrameParent::TriggerRepaint()
+{
+  nsIFrame* docFrame = mFrameLoader->GetPrimaryFrameOfOwningContent();
+  if (!docFrame) {
+    // Bad, but nothing we can do about it (XXX/cjones: or is there?
+    // maybe bug 589337?).  When the new frame is created, we'll
+    // probably still be the current render frame and will get to draw
+    // our content then.  Or, we're shutting down and this update goes
+    // to /dev/null.
+    return;
+  }
+
+  docFrame->InvalidateLayer(nsDisplayItem::TYPE_REMOTE);
+}
+
+uint64_t
+RenderFrameParent::GetLayerTreeId() const
+{
+  return mLayersId;
+}
+
+void
+RenderFrameParent::BuildDisplayList(nsDisplayListBuilder* aBuilder,
+                                    nsSubDocumentFrame* aFrame,
+                                    const nsRect& aDirtyRect,
+                                    const nsDisplayListSet& aLists)
+{
+  // We're the subdoc for <browser remote="true"> and it has
+  // painted content.  Display its shadow layer tree.
+  DisplayListClipState::AutoSaveRestore clipState(aBuilder);
+
+  nsPoint offset = aBuilder->ToReferenceFrame(aFrame);
+  nsRect bounds = aFrame->EnsureInnerView()->GetBounds() + offset;
+  clipState.ClipContentDescendants(bounds);
+
+  aLists.Content()->AppendToTop(
+    new (aBuilder) nsDisplayRemote(aBuilder, aFrame, this));
+}
+
+void
+RenderFrameParent::GetTextureFactoryIdentifier(TextureFactoryIdentifier* aTextureFactoryIdentifier)
+{
+  RefPtr<LayerManager> lm = mFrameLoader ? GetFrom(mFrameLoader) : nullptr;
+  // Perhaps the document containing this frame currently has no presentation?
+  if (lm && lm->AsClientLayerManager()) {
+    *aTextureFactoryIdentifier = lm->AsClientLayerManager()->GetTextureFactoryIdentifier();
+  } else {
+    *aTextureFactoryIdentifier = TextureFactoryIdentifier();
+  }
+}
+
+void
+RenderFrameParent::TakeFocusForClickFromTap()
+{
+  nsIFocusManager* fm = nsFocusManager::GetFocusManager();
+  if (!fm) {
+    return;
+  }
+  nsCOMPtr<nsIContent> owner = mFrameLoader->GetOwnerContent();
+  if (!owner) {
+    return;
+  }
+  nsCOMPtr<nsIDOMElement> element = do_QueryInterface(owner);
+  if (!element) {
+    return;
+  }
+  fm->SetFocus(element, nsIFocusManager::FLAG_BYMOUSE |
+                        nsIFocusManager::FLAG_BYTOUCH |
+                        nsIFocusManager::FLAG_NOSCROLL);
+}
+
+void
+RenderFrameParent::EnsureLayersConnected()
+{
+  RefPtr<LayerManager> lm = GetFrom(mFrameLoader);
+  if (!lm) {
+    return;
+  }
+
+  ClientLayerManager* client = lm->AsClientLayerManager();
+  if (!client) {
+    return;
+  }
+
+  client->GetRemoteRenderer()->SendNotifyChildRecreated(mLayersId);
+}
+
+} // namespace layout
+} // namespace mozilla
+
+nsDisplayRemote::nsDisplayRemote(nsDisplayListBuilder* aBuilder,
+                                 nsSubDocumentFrame* aFrame,
+                                 RenderFrameParent* aRemoteFrame)
+  : nsDisplayItem(aBuilder, aFrame)
+  , mRemoteFrame(aRemoteFrame)
+  , mEventRegionsOverride(EventRegionsOverride::NoOverride)
+{
+  if (aBuilder->IsBuildingLayerEventRegions()) {
+    bool frameIsPointerEventsNone =
+      aFrame->StyleUserInterface()->GetEffectivePointerEvents(aFrame) ==
+        NS_STYLE_POINTER_EVENTS_NONE;
+    if (aBuilder->IsInsidePointerEventsNoneDoc() || frameIsPointerEventsNone) {
+      mEventRegionsOverride |= EventRegionsOverride::ForceEmptyHitRegion;
+    }
+    if (nsLayoutUtils::HasDocumentLevelListenersForApzAwareEvents(aFrame->PresContext()->PresShell())) {
+      mEventRegionsOverride |= EventRegionsOverride::ForceDispatchToContent;
+    }
+  }
+}
+
+already_AddRefed<Layer>
+nsDisplayRemote::BuildLayer(nsDisplayListBuilder* aBuilder,
+                            LayerManager* aManager,
+                            const ContainerLayerParameters& aContainerParameters)
+{
+  int32_t appUnitsPerDevPixel = mFrame->PresContext()->AppUnitsPerDevPixel();
+  nsIntRect visibleRect = GetVisibleRect().ToNearestPixels(appUnitsPerDevPixel);
+  visibleRect += aContainerParameters.mOffset;
+  RefPtr<Layer> layer = mRemoteFrame->BuildLayer(aBuilder, mFrame, aManager, visibleRect, this, aContainerParameters);
+  if (layer && layer->AsContainerLayer()) {
+    layer->AsContainerLayer()->SetEventRegionsOverride(mEventRegionsOverride);
+  }
+  return layer.forget();
+}
diff --git a/layout/ipc/RenderFrameParent.h b/layout/ipc/RenderFrameParent.h
new file mode 100644
index 0000000000..274f8ff6df
--- /dev/null
+++ b/layout/ipc/RenderFrameParent.h
@@ -0,0 +1,161 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*-
+ * vim: sw=2 ts=8 et :
+ */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef mozilla_layout_RenderFrameParent_h
+#define mozilla_layout_RenderFrameParent_h
+
+#include "mozilla/Attributes.h"
+#include <map>
+
+#include "mozilla/layers/APZUtils.h"
+#include "mozilla/layers/LayersTypes.h"
+#include "mozilla/layout/PRenderFrameParent.h"
+#include "nsDisplayList.h"
+
+class nsFrameLoader;
+class nsSubDocumentFrame;
+
+namespace mozilla {
+
+class InputEvent;
+
+namespace layers {
+class AsyncDragMetrics;
+class TargetConfig;
+struct TextureFactoryIdentifier;
+struct ScrollableLayerGuid;
+} // namespace layers
+
+namespace layout {
+
+class RenderFrameParent : public PRenderFrameParent
+{
+  typedef mozilla::layers::AsyncDragMetrics AsyncDragMetrics;
+  typedef mozilla::layers::FrameMetrics FrameMetrics;
+  typedef mozilla::layers::ContainerLayer ContainerLayer;
+  typedef mozilla::layers::Layer Layer;
+  typedef mozilla::layers::LayerManager LayerManager;
+  typedef mozilla::layers::TargetConfig TargetConfig;
+  typedef mozilla::ContainerLayerParameters ContainerLayerParameters;
+  typedef mozilla::layers::TextureFactoryIdentifier TextureFactoryIdentifier;
+  typedef mozilla::layers::ScrollableLayerGuid ScrollableLayerGuid;
+  typedef mozilla::layers::TouchBehaviorFlags TouchBehaviorFlags;
+  typedef mozilla::layers::ZoomConstraints ZoomConstraints;
+  typedef FrameMetrics::ViewID ViewID;
+
+public:
+
+
+  /**
+   * Select the desired scrolling behavior.  If ASYNC_PAN_ZOOM is
+   * chosen, then RenderFrameParent will watch input events and use
+   * them to asynchronously pan and zoom.
+   */
+  RenderFrameParent(nsFrameLoader* aFrameLoader, bool* aSuccess);
+  virtual ~RenderFrameParent();
+
+  bool Init(nsFrameLoader* aFrameLoader);
+  bool IsInitted();
+  void Destroy();
+
+  void BuildDisplayList(nsDisplayListBuilder* aBuilder,
+                        nsSubDocumentFrame* aFrame,
+                        const nsRect& aDirtyRect,
+                        const nsDisplayListSet& aLists);
+
+  already_AddRefed<Layer> BuildLayer(nsDisplayListBuilder* aBuilder,
+                                     nsIFrame* aFrame,
+                                     LayerManager* aManager,
+                                     const nsIntRect& aVisibleRect,
+                                     nsDisplayItem* aItem,
+                                     const ContainerLayerParameters& aContainerParameters);
+
+  void OwnerContentChanged(nsIContent* aContent);
+
+  bool HitTest(const nsRect& aRect);
+
+  void GetTextureFactoryIdentifier(TextureFactoryIdentifier* aTextureFactoryIdentifier);
+
+  inline uint64_t GetLayersId() { return mLayersId; }
+
+  void TakeFocusForClickFromTap();
+
+  void EnsureLayersConnected();
+
+protected:
+  void ActorDestroy(ActorDestroyReason why) override;
+
+  virtual bool RecvNotifyCompositorTransaction() override;
+
+private:
+  void TriggerRepaint();
+  void DispatchEventForPanZoomController(const InputEvent& aEvent);
+
+  uint64_t GetLayerTreeId() const;
+
+  // When our child frame is pushing transactions directly to the
+  // compositor, this is the ID of its layer tree in the compositor's
+  // context.
+  uint64_t mLayersId;
+
+  RefPtr<nsFrameLoader> mFrameLoader;
+  RefPtr<ContainerLayer> mContainer;
+
+  // True after Destroy() has been called, which is triggered
+  // originally by nsFrameLoader::Destroy().  After this point, we can
+  // no longer safely ask the frame loader to find its nearest layer
+  // manager, because it may have been disconnected from the DOM.
+  // It's still OK to *tell* the frame loader that we've painted after
+  // it's destroyed; it'll just ignore us, and we won't be able to
+  // find an nsIFrame to invalidate.  See ShadowLayersUpdated().
+  //
+  // Prefer the extra bit of state to null'ing out mFrameLoader in
+  // Destroy() so that less code needs to be special-cased for after
+  // Destroy().
+  // 
+  // It's possible for mFrameLoader==null and
+  // mFrameLoaderDestroyed==false.
+  bool mFrameLoaderDestroyed;
+
+  bool mAsyncPanZoomEnabled;
+  bool mInitted;
+};
+
+} // namespace layout
+} // namespace mozilla
+
+/**
+ * A DisplayRemote exists solely to graft a child process's shadow
+ * layer tree (for a given RenderFrameParent) into its parent
+ * process's layer tree.
+ */
+class nsDisplayRemote : public nsDisplayItem
+{
+  typedef mozilla::layout::RenderFrameParent RenderFrameParent;
+
+public:
+  nsDisplayRemote(nsDisplayListBuilder* aBuilder, nsSubDocumentFrame* aFrame,
+                  RenderFrameParent* aRemoteFrame);
+
+  virtual LayerState GetLayerState(nsDisplayListBuilder* aBuilder,
+                                   LayerManager* aManager,
+                                   const ContainerLayerParameters& aParameters) override
+  { return mozilla::LAYER_ACTIVE_FORCE; }
+
+  virtual already_AddRefed<Layer>
+  BuildLayer(nsDisplayListBuilder* aBuilder, LayerManager* aManager,
+             const ContainerLayerParameters& aContainerParameters) override;
+
+  NS_DISPLAY_DECL_NAME("Remote", TYPE_REMOTE)
+
+private:
+  RenderFrameParent* mRemoteFrame;
+  mozilla::layers::EventRegionsOverride mEventRegionsOverride;
+};
+
+
+#endif  // mozilla_layout_RenderFrameParent_h
diff --git a/layout/ipc/VsyncChild.cpp b/layout/ipc/VsyncChild.cpp
new file mode 100644
index 0000000000..45372b89ab
--- /dev/null
+++ b/layout/ipc/VsyncChild.cpp
@@ -0,0 +1,94 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "VsyncChild.h"
+
+#include "mozilla/VsyncDispatcher.h"
+#include "nsThreadUtils.h"
+
+namespace mozilla {
+namespace layout {
+
+VsyncChild::VsyncChild()
+  : mObservingVsync(false)
+  , mIsShutdown(false)
+  , mVsyncRate(TimeDuration::Forever())
+{
+  MOZ_ASSERT(NS_IsMainThread());
+}
+
+VsyncChild::~VsyncChild()
+{
+  MOZ_ASSERT(NS_IsMainThread());
+}
+
+bool
+VsyncChild::SendObserve()
+{
+  MOZ_ASSERT(NS_IsMainThread());
+  if (!mObservingVsync && !mIsShutdown) {
+    mObservingVsync = true;
+    PVsyncChild::SendObserve();
+  }
+  return true;
+}
+
+bool
+VsyncChild::SendUnobserve()
+{
+  MOZ_ASSERT(NS_IsMainThread());
+  if (mObservingVsync && !mIsShutdown) {
+    mObservingVsync = false;
+    PVsyncChild::SendUnobserve();
+  }
+  return true;
+}
+
+void
+VsyncChild::ActorDestroy(ActorDestroyReason aActorDestroyReason)
+{
+  MOZ_ASSERT(NS_IsMainThread());
+  MOZ_ASSERT(!mIsShutdown);
+  mIsShutdown = true;
+  mObserver = nullptr;
+}
+
+bool
+VsyncChild::RecvNotify(const TimeStamp& aVsyncTimestamp)
+{
+  MOZ_ASSERT(NS_IsMainThread());
+  MOZ_ASSERT(!mIsShutdown);
+  if (mObservingVsync && mObserver) {
+    mObserver->NotifyVsync(aVsyncTimestamp);
+  }
+  return true;
+}
+
+void
+VsyncChild::SetVsyncObserver(VsyncObserver* aVsyncObserver)
+{
+  MOZ_ASSERT(NS_IsMainThread());
+  mObserver = aVsyncObserver;
+}
+
+TimeDuration
+VsyncChild::GetVsyncRate()
+{
+  if (mVsyncRate == TimeDuration::Forever()) {
+    PVsyncChild::SendRequestVsyncRate();
+  }
+
+  return mVsyncRate;
+}
+
+bool
+VsyncChild::RecvVsyncRate(const float& aVsyncRate)
+{
+  mVsyncRate = TimeDuration::FromMilliseconds(aVsyncRate);
+  return true;
+}
+
+} // namespace layout
+} // namespace mozilla
diff --git a/layout/ipc/VsyncChild.h b/layout/ipc/VsyncChild.h
new file mode 100644
index 0000000000..88896d643b
--- /dev/null
+++ b/layout/ipc/VsyncChild.h
@@ -0,0 +1,62 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef mozilla_layout_ipc_VsyncChild_h
+#define mozilla_layout_ipc_VsyncChild_h
+
+#include "mozilla/layout/PVsyncChild.h"
+#include "nsISupportsImpl.h"
+#include "mozilla/RefPtr.h"
+
+namespace mozilla {
+
+class VsyncObserver;
+
+namespace ipc {
+class BackgroundChildImpl;
+} // namespace ipc
+
+namespace layout {
+
+// The PVsyncChild actor receives a vsync event from the main process and
+// delivers it to the child process. Currently this is restricted to the main
+// thread only. The actor will stay alive until the process dies or its
+// PVsyncParent actor dies.
+class VsyncChild final : public PVsyncChild
+{
+  NS_INLINE_DECL_REFCOUNTING(VsyncChild)
+
+  friend class mozilla::ipc::BackgroundChildImpl;
+
+public:
+  // Hide the SendObserve/SendUnobserve in PVsyncChild. We add an flag
+  // mObservingVsync to handle the race problem of unobserving vsync event.
+  bool SendObserve();
+  bool SendUnobserve();
+
+  // Bind a VsyncObserver into VsyncChild after ipc channel connected.
+  void SetVsyncObserver(VsyncObserver* aVsyncObserver);
+  TimeDuration GetVsyncRate();
+
+private:
+  VsyncChild();
+  virtual ~VsyncChild();
+
+  virtual bool RecvNotify(const TimeStamp& aVsyncTimestamp) override;
+  virtual bool RecvVsyncRate(const float& aVsyncRate) override;
+  virtual void ActorDestroy(ActorDestroyReason aActorDestroyReason) override;
+
+  bool mObservingVsync;
+  bool mIsShutdown;
+
+  // The content side vsync observer.
+  RefPtr<VsyncObserver> mObserver;
+  TimeDuration mVsyncRate;
+};
+
+} // namespace layout
+} // namespace mozilla
+
+#endif  // mozilla_layout_ipc_VsyncChild_h
diff --git a/layout/ipc/VsyncParent.cpp b/layout/ipc/VsyncParent.cpp
new file mode 100644
index 0000000000..8ffe8abc4c
--- /dev/null
+++ b/layout/ipc/VsyncParent.cpp
@@ -0,0 +1,121 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "VsyncParent.h"
+
+#include "BackgroundParent.h"
+#include "BackgroundParentImpl.h"
+#include "gfxPlatform.h"
+#include "mozilla/Unused.h"
+#include "nsIThread.h"
+#include "nsThreadUtils.h"
+#include "VsyncSource.h"
+
+namespace mozilla {
+
+using namespace ipc;
+
+namespace layout {
+
+/*static*/ already_AddRefed<VsyncParent>
+VsyncParent::Create()
+{
+  AssertIsOnBackgroundThread();
+  RefPtr<gfx::VsyncSource> vsyncSource = gfxPlatform::GetPlatform()->GetHardwareVsync();
+  RefPtr<VsyncParent> vsyncParent = new VsyncParent();
+  vsyncParent->mVsyncDispatcher = vsyncSource->GetRefreshTimerVsyncDispatcher();
+  return vsyncParent.forget();
+}
+
+VsyncParent::VsyncParent()
+  : mObservingVsync(false)
+  , mDestroyed(false)
+  , mBackgroundThread(NS_GetCurrentThread())
+{
+  MOZ_ASSERT(mBackgroundThread);
+  AssertIsOnBackgroundThread();
+}
+
+VsyncParent::~VsyncParent()
+{
+  // Since we use NS_INLINE_DECL_THREADSAFE_REFCOUNTING, we can't make sure
+  // VsyncParent is always released on the background thread.
+}
+
+bool
+VsyncParent::NotifyVsync(TimeStamp aTimeStamp)
+{
+  // Called on hardware vsync thread. We should post to current ipc thread.
+  MOZ_ASSERT(!IsOnBackgroundThread());
+  nsCOMPtr<nsIRunnable> vsyncEvent =
+    NewRunnableMethod<TimeStamp>(this,
+                                 &VsyncParent::DispatchVsyncEvent,
+                                 aTimeStamp);
+  MOZ_ALWAYS_SUCCEEDS(mBackgroundThread->Dispatch(vsyncEvent, NS_DISPATCH_NORMAL));
+  return true;
+}
+
+void
+VsyncParent::DispatchVsyncEvent(TimeStamp aTimeStamp)
+{
+  AssertIsOnBackgroundThread();
+
+  // If we call NotifyVsync() when we handle ActorDestroy() message, we might
+  // still call DispatchVsyncEvent().
+  // Similarly, we might also receive RecvUnobserveVsync() when call
+  // NotifyVsync(). We use mObservingVsync and mDestroyed flags to skip this
+  // notification.
+  if (mObservingVsync && !mDestroyed) {
+    Unused << SendNotify(aTimeStamp);
+  }
+}
+
+bool
+VsyncParent::RecvRequestVsyncRate()
+{
+  AssertIsOnBackgroundThread();
+  TimeDuration vsyncRate = gfxPlatform::GetPlatform()->GetHardwareVsync()->GetGlobalDisplay().GetVsyncRate();
+  Unused << SendVsyncRate(vsyncRate.ToMilliseconds());
+  return true;
+}
+
+bool
+VsyncParent::RecvObserve()
+{
+  AssertIsOnBackgroundThread();
+  if (!mObservingVsync) {
+    mVsyncDispatcher->AddChildRefreshTimer(this);
+    mObservingVsync = true;
+    return true;
+  }
+  return false;
+}
+
+bool
+VsyncParent::RecvUnobserve()
+{
+  AssertIsOnBackgroundThread();
+  if (mObservingVsync) {
+    mVsyncDispatcher->RemoveChildRefreshTimer(this);
+    mObservingVsync = false;
+    return true;
+  }
+  return false;
+}
+
+void
+VsyncParent::ActorDestroy(ActorDestroyReason aReason)
+{
+  MOZ_ASSERT(!mDestroyed);
+  AssertIsOnBackgroundThread();
+  if (mObservingVsync) {
+    mVsyncDispatcher->RemoveChildRefreshTimer(this);
+  }
+  mVsyncDispatcher = nullptr;
+  mDestroyed = true;
+}
+
+} // namespace layout
+} // namespace mozilla
diff --git a/layout/ipc/VsyncParent.h b/layout/ipc/VsyncParent.h
new file mode 100644
index 0000000000..33e96c4c60
--- /dev/null
+++ b/layout/ipc/VsyncParent.h
@@ -0,0 +1,56 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef mozilla_layout_ipc_VsyncParent_h
+#define mozilla_layout_ipc_VsyncParent_h
+
+#include "mozilla/layout/PVsyncParent.h"
+#include "mozilla/VsyncDispatcher.h"
+#include "nsCOMPtr.h"
+#include "mozilla/RefPtr.h"
+
+class nsIThread;
+
+namespace mozilla {
+
+namespace ipc {
+class BackgroundParentImpl;
+} // namespace ipc
+
+namespace layout {
+
+// Use PBackground thread in the main process to send vsync notifications to
+// content process. This actor will be released when its parent protocol calls
+// DeallocPVsyncParent().
+class VsyncParent final : public PVsyncParent,
+                          public VsyncObserver
+{
+  friend class mozilla::ipc::BackgroundParentImpl;
+
+private:
+  static already_AddRefed<VsyncParent> Create();
+
+  VsyncParent();
+  virtual ~VsyncParent();
+
+  virtual bool NotifyVsync(TimeStamp aTimeStamp) override;
+  virtual bool RecvRequestVsyncRate() override;
+
+  virtual bool RecvObserve() override;
+  virtual bool RecvUnobserve() override;
+  virtual void ActorDestroy(ActorDestroyReason aActorDestroyReason) override;
+
+  void DispatchVsyncEvent(TimeStamp aTimeStamp);
+
+  bool mObservingVsync;
+  bool mDestroyed;
+  nsCOMPtr<nsIThread> mBackgroundThread;
+  RefPtr<RefreshTimerVsyncDispatcher> mVsyncDispatcher;
+};
+
+} // namespace layout
+} // namespace mozilla
+
+#endif  //mozilla_layout_ipc_VsyncParent_h
diff --git a/layout/ipc/moz.build b/layout/ipc/moz.build
new file mode 100644
index 0000000000..d9cf962ca2
--- /dev/null
+++ b/layout/ipc/moz.build
@@ -0,0 +1,41 @@
+# -*- Mode: python; indent-tabs-mode: nil; tab-width: 40 -*-
+# vim: set filetype=python:
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+with Files('**'):
+    BUG_COMPONENT = ('Core', 'Layout: View Rendering')
+
+EXPORTS.mozilla.layout += [
+    'RenderFrameChild.h',
+    'RenderFrameParent.h',
+    'VsyncChild.h',
+    'VsyncParent.h',
+]
+
+UNIFIED_SOURCES += [
+    'RenderFrameChild.cpp',
+    'RenderFrameParent.cpp',
+]
+
+SOURCES += [
+    'VsyncChild.cpp',
+    'VsyncParent.cpp',
+]
+
+IPDL_SOURCES = [
+    'PRenderFrame.ipdl',
+    'PVsync.ipdl',
+]
+
+include('/ipc/chromium/chromium-config.mozbuild')
+
+FINAL_LIBRARY = 'xul'
+
+LOCAL_INCLUDES += [
+    '/dom/base',
+    '/layout/base',
+    '/layout/generic',
+    '/layout/xul',
+]