Trace main thread commit in flow events.

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 344 matching lines @@
   SharedBitmapManager* shared_bitmap_manager() const {
     return shared_bitmap_manager_;
   }
   gpu::GpuMemoryBufferManager* gpu_memory_buffer_manager() const {
     return gpu_memory_buffer_manager_;
   }
   TaskGraphRunner* task_graph_runner() const { return task_graph_runner_; }
 
   MicroBenchmarkController micro_benchmark_controller_;
 
+  void OnCommitForSwapPromises();
+
  private:
   void InitializeProxy(scoped_ptr<Proxy> proxy);
 
   void PaintLayerContents(
       const RenderSurfaceLayerList& render_surface_layer_list,
       ResourceUpdateQueue* queue,
       bool* did_paint_content,
       bool* need_more_updates);
   void PaintMasksForRenderSurface(Layer* render_surface_layer,
                                   ResourceUpdateQueue* queue,
@@ skipping 114 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_