rAF: Introduce FrameRequestCallbackCollection for managing rAF callbacks.

Source/core/dom/RequestAnimationFrameCallback.idl

-/*
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-
-callback interface RequestAnimationFrameCallback{
-    // highResTime is passed as high resolution timestamp, see
-    // http://www.w3.org/TR/hr-time/ for details.
-    void handleEvent(double highResTime);
-};