Update from https://crrev.com/315085

cc/trees/layer_tree_host.h

 // 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.
 
 #ifndef CC_TREES_LAYER_TREE_HOST_H_
 #define CC_TREES_LAYER_TREE_HOST_H_
 
 #include <limits>
 #include <set>
 #include <string>
@@ skipping 92 matching lines @@
       SharedBitmapManager* shared_bitmap_manager,
       gpu::GpuMemoryBufferManager* gpu_memory_buffer_manager,
       const LayerTreeSettings& settings,
       scoped_refptr<base::SingleThreadTaskRunner> main_task_runner,
       scoped_ptr<BeginFrameSource> external_begin_frame_source);
   virtual ~LayerTreeHost();
 
   void SetLayerTreeHostClientReady();
 
   // LayerTreeHost interface to Proxy.
-  void WillBeginMainFrame() {
-    client_->WillBeginMainFrame(source_frame_number_);
-  }
+  void WillBeginMainFrame();
   void DidBeginMainFrame();
   void BeginMainFrame(const BeginFrameArgs& args);
   void AnimateLayers(base::TimeTicks monotonic_frame_begin_time);
   void DidStopFlinging();
   void Layout();
   void BeginCommitOnImplThread(LayerTreeHostImpl* host_impl);
   void FinishCommitOnImplThread(LayerTreeHostImpl* host_impl);
   void WillCommit();
   void CommitComplete();
   void SetOutputSurface(scoped_ptr<OutputSurface> output_surface);
@@ skipping 356 matching lines @@
 
   uint32_t surface_id_namespace_;
   uint32_t next_surface_sequence_;
 
   DISALLOW_COPY_AND_ASSIGN(LayerTreeHost);
 };
 
 }  // namespace cc
 
 #endif  // CC_TREES_LAYER_TREE_HOST_H_