rAF: Introduce FrameRequestCallbackCollection for managing rAF callbacks.

Source/core/dom/Document.h

Index: Source/core/dom/Document.h
diff --git a/Source/core/dom/Document.h b/Source/core/dom/Document.h
index 43226e4f088d6f43fc46f71e9578b0dfb19de206..149208d3892b5beb88f4d70d8341900b529bd85f 100644
--- a/Source/core/dom/Document.h
+++ b/Source/core/dom/Document.h
@@ -105,6 +105,7 @@ class FloatRect;
 class FormController;
 class Frame;
 class FrameHost;
+class FrameRequestCallback;
 class FrameView;
 class HTMLAllCollection;
 class HTMLCanvasElement;
@@ -134,7 +135,6 @@ class ProcessingInstruction;
 class QualifiedName;
 class Range;
 class LayoutView;
-class RequestAnimationFrameCallback;
 class ResourceFetcher;
 class SVGDocumentExtensions;
 class SVGUseElement;
@@ -949,7 +949,7 @@ public:
 
     const DocumentTiming& timing() const { return m_documentTiming; }
 
-    int requestAnimationFrame(RequestAnimationFrameCallback*);
+    int requestAnimationFrame(FrameRequestCallback*);
     void cancelAnimationFrame(int id);
     void serviceScriptedAnimations(double monotonicAnimationStartTime);