[cc] Forward BeginFrameAcks through DirectCFS and CFSSupport.

cc/test/fake_compositor_frame_sink_client.h

 // Copyright 2013 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.
 
 #ifndef CC_TEST_FAKE_COMPOSITOR_FRAME_SINK_CLIENT_H_
 #define CC_TEST_FAKE_COMPOSITOR_FRAME_SINK_CLIENT_H_
 
 #include "cc/output/compositor_frame_sink_client.h"
 #include "cc/output/managed_memory_policy.h"
 
 namespace cc {
 
 class FakeCompositorFrameSinkClient : public CompositorFrameSinkClient {
  public:
   FakeCompositorFrameSinkClient() : memory_policy_(0) {}
 
-  void SetBeginFrameSource(BeginFrameSource* source) override {}
+  void SetBeginFrameSource(BeginFrameSource* source) override;
   void DidReceiveCompositorFrameAck() override;
   void ReclaimResources(const ReturnedResourceArray& resources) override {}
   void DidLoseCompositorFrameSink() override;
   void SetExternalTilePriorityConstraints(
       const gfx::Rect& viewport_rect_for_tile_priority,
       const gfx::Transform& transform_for_tile_priority) override {}
   void SetMemoryPolicy(const ManagedMemoryPolicy& policy) override;
   void SetTreeActivationCallback(const base::Closure&) override {}
   void OnDraw(const gfx::Transform& transform,
               const gfx::Rect& viewport,
               bool resourceless_software_draw) override {}
 
   int ack_count() { return ack_count_; }
 
   bool did_lose_compositor_frame_sink_called() {
     return did_lose_compositor_frame_sink_called_;
   }
 
   const ManagedMemoryPolicy& memory_policy() const { return memory_policy_; }
 
+  BeginFrameSource* begin_frame_source() const { return begin_frame_source_; }
+
  private:
   int ack_count_ = 0;
   bool did_lose_compositor_frame_sink_called_ = false;
   ManagedMemoryPolicy memory_policy_;
+  BeginFrameSource* begin_frame_source_;
 };
 
 }  // namespace cc
 
 #endif  // CC_TEST_FAKE_COMPOSITOR_FRAME_SINK_CLIENT_H_