diff -r 000000000000 -r 6474c204b198 layout/style/nsCSSPseudoClasses.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/layout/style/nsCSSPseudoClasses.h	Wed Dec 31 06:09:35 2014 +0100
@@ -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/. */
+
+/* atom list for CSS pseudo-classes */
+
+#ifndef nsCSSPseudoClasses_h___
+#define nsCSSPseudoClasses_h___
+
+#include "nsStringFwd.h"
+
+class nsIAtom;
+
+class nsCSSPseudoClasses {
+public:
+
+  static void AddRefAtoms();
+
+  enum Type {
+#define CSS_PSEUDO_CLASS(_name, _value, _pref)        \
+    ePseudoClass_##_name,
+#include "nsCSSPseudoClassList.h"
+#undef CSS_PSEUDO_CLASS
+    ePseudoClass_Count,
+    ePseudoClass_NotPseudoClass /* This value MUST be last!  SelectorMatches
+                                   depends on it. */
+  };
+
+  static Type GetPseudoType(nsIAtom* aAtom);
+  static bool HasStringArg(Type aType);
+  static bool HasNthPairArg(Type aType);
+  static bool HasSelectorListArg(Type aType) {
+    return aType == ePseudoClass_any;
+  }
+  static bool IsUserActionPseudoClass(Type aType);
+
+  // Should only be used on types other than Count and NotPseudoClass
+  static void PseudoTypeToString(Type aType, nsAString& aString);
+};
+
+#endif /* nsCSSPseudoClasses_h___ */