Add latency measurement system

cc/test/fake_layer_tree_host_impl_client.h

 // Copyright 2012 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_LAYER_TREE_HOST_IMPL_CLIENT_H_
 #define CC_TEST_FAKE_LAYER_TREE_HOST_IMPL_CLIENT_H_
 
 #include "cc/layer_tree_host_impl.h"
 
 namespace cc {
 
 class FakeLayerTreeHostImplClient : public LayerTreeHostImplClient {
  public:
   // LayerTreeHostImplClient implementation.
   virtual void didLoseOutputSurfaceOnImplThread() OVERRIDE { }
   virtual void onSwapBuffersCompleteOnImplThread() OVERRIDE { }
   virtual void onVSyncParametersChanged(
       base::TimeTicks,
       base::TimeDelta) OVERRIDE { }
   virtual void onCanDrawStateChanged(bool) OVERRIDE { }
   virtual void setNeedsRedrawOnImplThread() OVERRIDE { }
   virtual void setNeedsCommitOnImplThread() OVERRIDE { }
   virtual void setNeedsManageTilesOnImplThread() OVERRIDE { }
   virtual void postAnimationEventsToMainThreadOnImplThread(
       scoped_ptr<AnimationEventsVector>,
       base::Time) OVERRIDE { }
   virtual bool reduceContentsTextureMemoryOnImplThread(size_t, int) OVERRIDE;
   virtual void sendManagedMemoryStats() OVERRIDE { }
+  virtual void onReceivedLatencyInfo(
+      const WebKit::WebLatencyInfoImpl&) OVERRIDE { }
 };
 
 }  // namespace cc
 
 #endif  // CC_TEST_FAKE_LAYER_TREE_HOST_IMPL_CLIENT_H_