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diff --git a/layout/style/nsCSSPseudoElements.h b/layout/style/nsCSSPseudoElements.h
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+/* -*- 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/. */
+
+/* atom list for CSS pseudo-elements */
+
+#ifndef nsCSSPseudoElements_h___
+#define nsCSSPseudoElements_h___
+
+#include "nsIAtom.h"
+#include "mozilla/CSSEnabledState.h"
+#include "mozilla/Compiler.h"
+
+// Is this pseudo-element a CSS2 pseudo-element that can be specified
+// with the single colon syntax (in addition to the double-colon syntax,
+// which can be used for all pseudo-elements)?
+#define CSS_PSEUDO_ELEMENT_IS_CSS2                     (1<<0)
+// Is this pseudo-element a pseudo-element that can contain other
+// elements?
+// (Currently pseudo-elements are either leaves of the tree (relative to
+// real elements) or they contain other elements in a non-tree-like
+// manner (i.e., like incorrectly-nested start and end tags).  It's
+// possible that in the future there might be container pseudo-elements
+// that form a properly nested tree structure.  If that happens, we
+// should probably split this flag into two.)
+#define CSS_PSEUDO_ELEMENT_CONTAINS_ELEMENTS           (1<<1)
+// Flag to add the ability to take into account style attribute set for the
+// pseudo element (by default it's ignored).
+#define CSS_PSEUDO_ELEMENT_SUPPORTS_STYLE_ATTRIBUTE    (1<<2)
+// Flag that indicate the pseudo-element supports a user action pseudo-class
+// following it, such as :active or :hover.  This would normally correspond
+// to whether the pseudo-element is tree-like, but we don't support these
+// pseudo-classes on ::before and ::after generated content yet.  See
+// http://dev.w3.org/csswg/selectors4/#pseudo-elements.
+#define CSS_PSEUDO_ELEMENT_SUPPORTS_USER_ACTION_STATE  (1<<3)
+// Is content prevented from parsing selectors containing this pseudo-element?
+#define CSS_PSEUDO_ELEMENT_UA_SHEET_ONLY               (1<<4)
+
+namespace mozilla {
+
+// The total count of CSSPseudoElement is less than 256,
+// so use uint8_t as its underlying type.
+typedef uint8_t CSSPseudoElementTypeBase;
+enum class CSSPseudoElementType : CSSPseudoElementTypeBase {
+  // If the actual pseudo-elements stop being first here, change
+  // GetPseudoType.
+#define CSS_PSEUDO_ELEMENT(_name, _value_, _flags) \
+  _name,
+#include "nsCSSPseudoElementList.h"
+#undef CSS_PSEUDO_ELEMENT
+  Count,
+  AnonBox = Count,
+#ifdef MOZ_XUL
+  XULTree,
+#endif
+  NotPseudo,
+  MAX
+};
+
+} // namespace mozilla
+
+// Empty class derived from nsIAtom so that function signatures can
+// require an atom from this atom list.
+class nsICSSPseudoElement : public nsIAtom {};
+
+class nsCSSPseudoElements
+{
+  typedef mozilla::CSSPseudoElementType Type;
+  typedef mozilla::CSSEnabledState EnabledState;
+
+public:
+  static void AddRefAtoms();
+
+  static bool IsPseudoElement(nsIAtom *aAtom);
+
+  static bool IsCSS2PseudoElement(nsIAtom *aAtom);
+
+#define CSS_PSEUDO_ELEMENT(_name, _value, _flags) \
+  static nsICSSPseudoElement* _name;
+#include "nsCSSPseudoElementList.h"
+#undef CSS_PSEUDO_ELEMENT
+
+  static Type GetPseudoType(nsIAtom* aAtom, EnabledState aEnabledState);
+
+  // Get the atom for a given Type.  aType must be < CSSPseudoElementType::Count
+  static nsIAtom* GetPseudoAtom(Type aType);
+
+  static bool PseudoElementContainsElements(const Type aType) {
+    return PseudoElementHasFlags(aType, CSS_PSEUDO_ELEMENT_CONTAINS_ELEMENTS);
+  }
+
+  static bool PseudoElementSupportsStyleAttribute(const Type aType) {
+    MOZ_ASSERT(aType < Type::Count);
+    return PseudoElementHasFlags(aType,
+                                 CSS_PSEUDO_ELEMENT_SUPPORTS_STYLE_ATTRIBUTE);
+  }
+
+  static bool PseudoElementSupportsUserActionState(const Type aType);
+
+  static bool IsEnabled(Type aType, EnabledState aEnabledState)
+  {
+    return !PseudoElementHasFlags(aType, CSS_PSEUDO_ELEMENT_UA_SHEET_ONLY) ||
+           (aEnabledState & EnabledState::eInUASheets);
+  }
+
+private:
+  // Does the given pseudo-element have all of the flags given?
+
+  // Work around https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64037 ,
+  // which is a general gcc bug that we seem to have hit only on Android/x86.
+#if defined(ANDROID) && defined(__i386__) && defined(__GNUC__) && \
+    !defined(__clang__)
+#if (MOZ_GCC_VERSION_AT_LEAST(4,8,0) && MOZ_GCC_VERSION_AT_MOST(4,8,4)) || \
+    (MOZ_GCC_VERSION_AT_LEAST(4,9,0) && MOZ_GCC_VERSION_AT_MOST(4,9,2))
+   __attribute__((noinline))
+#endif
+#endif
+  static bool PseudoElementHasFlags(const Type aType, uint32_t aFlags)
+  {
+    MOZ_ASSERT(aType < Type::Count);
+    return (kPseudoElementFlags[size_t(aType)] & aFlags) == aFlags;
+  }
+
+  static const uint32_t kPseudoElementFlags[size_t(Type::Count)];
+};
+
+#endif /* nsCSSPseudoElements_h___ */