compositor-worker: Allow registering compositor-frame callbacks.

Source/modules/compositorworker/CompositorWorkerGlobalScope.cpp

Index: Source/modules/compositorworker/CompositorWorkerGlobalScope.cpp
diff --git a/Source/modules/compositorworker/CompositorWorkerGlobalScope.cpp b/Source/modules/compositorworker/CompositorWorkerGlobalScope.cpp
index d4c47c0d724d78d63995f0db74d84815b93c1600..ac7fb2729dcbb4a2361798c80df17774c741269e 100644
--- a/Source/modules/compositorworker/CompositorWorkerGlobalScope.cpp
+++ b/Source/modules/compositorworker/CompositorWorkerGlobalScope.cpp
@@ -22,6 +22,7 @@ PassRefPtrWillBeRawPtr<CompositorWorkerGlobalScope> CompositorWorkerGlobalScope:
 
 CompositorWorkerGlobalScope::CompositorWorkerGlobalScope(const KURL& url, const String& userAgent, CompositorWorkerThread* thread, double timeOrigin, const SecurityOrigin* starterOrigin, PassOwnPtrWillBeRawPtr<WorkerClients> workerClients)
     : WorkerGlobalScope(url, userAgent, thread, timeOrigin, starterOrigin, workerClients)
+    , m_callbackCollection(this)
 {
 }
 
@@ -43,6 +44,21 @@ void CompositorWorkerGlobalScope::postMessage(ExecutionContext*, PassRefPtr<Seri
     thread()->workerObjectProxy().postMessageToWorkerObject(message, channels.release());
 }
 
+int CompositorWorkerGlobalScope::requestCompositorFrame(RequestAnimationFrameCallback* callback)
+{
+    return m_callbackCollection.registerCallback(callback);
+}
+
+void CompositorWorkerGlobalScope::cancelCompositorFrame(int id)
+{
+    m_callbackCollection.cancelCallback(id);
+}
+
+void CompositorWorkerGlobalScope::executeCompositorFrameCallbacks(double highResTimeNow)
+{
+    m_callbackCollection.executeCallbacks(highResTimeNow, highResTimeNow);
+}
+
 CompositorWorkerThread* CompositorWorkerGlobalScope::thread() const
 {
     return static_cast<CompositorWorkerThread*>(WorkerGlobalScope::thread());