Plumbing for frame-specific WebWidgets

Source/core/page/PageAnimator.h

Index: Source/core/page/PageAnimator.h
diff --git a/Source/core/page/PageAnimator.h b/Source/core/page/PageAnimator.h
index 154d35b4957ba04740467dc2b10eecb2e2b6200e..cd4182b9ee3409a6d47593c9b4e1059b72217e32 100644
--- a/Source/core/page/PageAnimator.h
+++ b/Source/core/page/PageAnimator.h
@@ -16,7 +16,7 @@ class PageAnimator final : public RefCountedWillBeGarbageCollected<PageAnimator>
 public:
     static PassRefPtrWillBeRawPtr<PageAnimator> create(Page&);
     void trace(Visitor*);
-    void scheduleVisualUpdate();
+    void scheduleVisualUpdate(LocalFrame* rootFrame = 0);

[dcheng, 2014/11/26 18:20:00]

This one is weird to me, because it's apparently called with non root frames a
lot. It seems like this will be addressed in the long term. In the meantime,
maybe it's best to omit the name for this one.

[kenrb, 2014/12/02 17:49:43]

Done.

     void serviceScriptedAnimations(double monotonicAnimationStartTime);
 
     void setAnimationFramePending() { m_animationFramePending = true; }