compositor-worker: Allow registering compositor-frame callbacks.

Source/modules/compositorworker/CompositorWorkerGlobalScope.h

Index: Source/modules/compositorworker/CompositorWorkerGlobalScope.h
diff --git a/Source/modules/compositorworker/CompositorWorkerGlobalScope.h b/Source/modules/compositorworker/CompositorWorkerGlobalScope.h
index 04b60198eecea27771ee6b0a42b32d3c52b63527..b8566a0a96c92b2a3e22abfc9b53d78c34f3179c 100644
--- a/Source/modules/compositorworker/CompositorWorkerGlobalScope.h
+++ b/Source/modules/compositorworker/CompositorWorkerGlobalScope.h
@@ -6,6 +6,7 @@
 #define CompositorWorkerGlobalScope_h
 
 #include "core/dom/MessagePort.h"
+#include "core/dom/RequestAnimationFrameCallbackCollection.h"
 #include "core/workers/WorkerGlobalScope.h"
 
 namespace blink {
@@ -25,7 +26,9 @@ public:
     void postMessage(ExecutionContext*, PassRefPtr<SerializedScriptValue>, const MessagePortArray*, ExceptionState&);
     DEFINE_ATTRIBUTE_EVENT_LISTENER(message);
 
-    void executeCompositorFrameCallbacks(double monotonicTimeNow);
+    int requestCompositorFrame(RequestAnimationFrameCallback*);

[esprehn, 2015/03/30 18:43:12]

Why not just call this thing requestAnimationFrame instead?

[sadrul, 2015/03/31 02:45:36]

Done.

+    void cancelCompositorFrame(int id);
+    void executeCompositorFrameCallbacks(double highResTimeNow);
 
     // ExecutionContext:
     bool isCompositorWorkerGlobalScope() const override { return true; }
@@ -33,6 +36,8 @@ public:
 private:
     CompositorWorkerGlobalScope(const KURL&, const String& userAgent, CompositorWorkerThread*, double timeOrigin, const SecurityOrigin*, PassOwnPtrWillBeRawPtr<WorkerClients>);
     CompositorWorkerThread* thread() const;
+
+    RequestAnimationFrameCallbackCollection m_callbackCollection;
 };
 
 } // namespace blink