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diff --git a/widget/nsWidgetInitData.h b/widget/nsWidgetInitData.h
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+/* -*- Mode: C++; tab-width: 40; 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 nsWidgetInitData_h__
+#define nsWidgetInitData_h__
+
+/**
+ * Window types
+ *
+ * Don't alter previously encoded enum values - 3rd party apps may look at
+ * these.
+ */
+enum nsWindowType {
+  eWindowType_toplevel,           // default top level window
+  eWindowType_dialog,             // top level window but usually handled differently
+                                  // by the OS
+  eWindowType_popup,              // used for combo boxes, etc
+  eWindowType_child,              // child windows (contained inside a window on the
+                                  // desktop (has no border))
+  eWindowType_invisible,          // windows that are invisible or offscreen
+  eWindowType_plugin,             // plugin window
+  eWindowType_plugin_ipc_chrome,  // chrome side native widget for plugins (e10s)
+  eWindowType_plugin_ipc_content, // content side puppet widget for plugins (e10s)
+  eWindowType_sheet,              // MacOSX sheet (special dialog class)
+};
+
+/**
+ * Popup types
+ *
+ * For eWindowType_popup
+ */
+enum nsPopupType {
+  ePopupTypePanel,
+  ePopupTypeMenu,
+  ePopupTypeTooltip,
+  ePopupTypeAny      = 0xF000 // used only to pass to
+                              // nsXULPopupManager::GetTopPopup
+};
+
+/**
+ * Popup levels specify the window ordering behaviour.
+ */
+enum nsPopupLevel {
+  // the popup appears just above its parent and maintains its position
+  // relative to the parent
+  ePopupLevelParent,
+  // the popup is a floating popup used for tool palettes. A parent window
+  // must be specified, but a platform implementation need not use this.
+  // On Windows, floating is generally equivalent to parent. On Mac, floating
+  // puts the popup at toplevel, but it will hide when the application is deactivated
+  ePopupLevelFloating,
+  // the popup appears on top of other windows, including those of other applications
+  ePopupLevelTop
+};
+
+/**
+ * Border styles
+ */
+enum nsBorderStyle {
+  eBorderStyle_none     = 0,      // no border, titlebar, etc.. opposite of
+                                  // all
+  eBorderStyle_all      = 1 << 0, // all window decorations
+  eBorderStyle_border   = 1 << 1, // enables the border on the window. these
+                                  // are only for decoration and are not
+                                  // resize handles
+  eBorderStyle_resizeh  = 1 << 2, // enables the resize handles for the
+                                  // window. if this is set, border is
+                                  // implied to also be set
+  eBorderStyle_title    = 1 << 3, // enables the titlebar for the window
+  eBorderStyle_menu     = 1 << 4, // enables the window menu button on the
+                                  // title bar. this being on should force
+                                  // the title bar to display
+  eBorderStyle_minimize = 1 << 5, // enables the minimize button so the user
+                                  // can minimize the window. turned off for
+                                  // tranient windows since they can not be
+                                  // minimized separate from their parent
+  eBorderStyle_maximize = 1 << 6, // enables the maxmize button so the user
+                                  // can maximize the window
+  eBorderStyle_close    = 1 << 7, // show the close button
+  eBorderStyle_default  = -1      // whatever the OS wants... i.e. don't do
+                                  // anything
+};
+
+/**
+ * Basic struct for widget initialization data.
+ * @see Create member function of nsIWidget
+ */
+
+struct nsWidgetInitData {
+  nsWidgetInitData() :
+      mWindowType(eWindowType_child),
+      mBorderStyle(eBorderStyle_default),
+      mPopupHint(ePopupTypePanel),
+      mPopupLevel(ePopupLevelTop),
+      mScreenId(0),
+      clipChildren(false),
+      clipSiblings(false),
+      mDropShadow(false),
+      mListenForResizes(false),
+      mUnicode(true),
+      mRTL(false),
+      mNoAutoHide(false),
+      mIsDragPopup(false),
+      mIsAnimationSuppressed(false),
+      mSupportTranslucency(false),
+      mMouseTransparent(false)
+  {
+  }
+
+  nsWindowType  mWindowType;
+  nsBorderStyle mBorderStyle;
+  nsPopupType   mPopupHint;
+  nsPopupLevel  mPopupLevel;
+  // B2G multi-screen support. Screen ID is for differentiating screens of
+  // windows, and due to the hardware limitation, it is platform-specific for
+  // now, which align with the value of display type defined in HWC.
+  uint32_t      mScreenId;
+  // when painting exclude area occupied by child windows and sibling windows
+  bool          clipChildren, clipSiblings, mDropShadow;
+  bool          mListenForResizes;
+  bool          mUnicode;
+  bool          mRTL;
+  bool          mNoAutoHide; // true for noautohide panels
+  bool          mIsDragPopup;  // true for drag feedback panels
+  // true if window creation animation is suppressed, e.g. for session restore
+  bool          mIsAnimationSuppressed;
+  // true if the window should support an alpha channel, if available.
+  bool          mSupportTranslucency;
+  // true if the window should be transparent to mouse events. Currently this is
+  // only valid for eWindowType_popup widgets
+  bool          mMouseTransparent;
+};
+
+#endif // nsWidgetInitData_h__