cc: Add receiver for CompositorFrameAck in LayerTreeHostImpl and forward it to the renderer.

cc/layer_tree_host_impl.cc

 // Copyright 2011 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "cc/layer_tree_host_impl.h"
 
 #include <algorithm>
 
 #include "base/basictypes.h"
 #include "base/debug/trace_event.h"
@@ skipping 778 matching lines @@
     // We always need to commit after changing the memory policy because the new
     // limit can result in more or less content having texture allocated for it.
     m_client->setNeedsCommitOnImplThread();
 }
 
 void LayerTreeHostImpl::OnVSyncParametersChanged(base::TimeTicks timebase, base::TimeDelta interval)
 {
     m_client->onVSyncParametersChanged(timebase, interval);
 }
 
-void LayerTreeHostImpl::OnSendFrameToParentCompositorAck(const CompositorFrameAck&)
+void LayerTreeHostImpl::OnSendFrameToParentCompositorAck(const CompositorFrameAck& ack)
 {
-    // TODO(danakj): Implement this.
+    if (!m_renderer)
+        return;
+
+    // TODO(piman): We may need to do some validation on this ack before processing it.
+    m_renderer->receiveCompositorFrameAck(ack);
 }
 
 void LayerTreeHostImpl::OnCanDrawStateChangedForTree(LayerTreeImpl*)
 {
     m_client->onCanDrawStateChanged(canDraw());
 }
 
 void LayerTreeHostImpl::drawLayers(FrameData& frame)
 {
     TRACE_EVENT0("cc", "LayerTreeHostImpl::drawLayers");
@@ skipping 805 matching lines @@
 
 void LayerTreeHostImpl::UnregisterAnimationController(LayerAnimationController* controller) {
 #if !defined(NDEBUG)
     if (ContainsKey(m_allAnimationControllers, controller))
         m_allAnimationControllers.erase(controller);
 #endif
     DidDeactivateAnimationController(controller);
 }
 
 }  // namespace cc