cc: Add main frame timing info to frame timing tracker.

cc/trees/layer_tree_host_impl.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_IMPL_H_
 #define CC_TREES_LAYER_TREE_HOST_IMPL_H_
 
 #include <set>
 #include <string>
 #include <vector>
@@ skipping 518 matching lines @@
 
   FrameTimingTracker* frame_timing_tracker() {
     return frame_timing_tracker_.get();
   }
 
   gfx::Vector2dF ScrollLayer(LayerImpl* layer_impl,
                              const gfx::Vector2dF& delta,
                              const gfx::Point& viewport_point,
                              bool is_wheel_scroll);
 
+  // Record main frame timing information.
+  // |start_of_main_frame_args| is the BeginFrameArgs of the beginning of the
+  // main frame (ie the frame that kicked off the main frame).
+  // |expected_next_main_frame_args| is the BeginFrameArgs of the frame that
+  // follows the completion of the main frame (whether it is activation or some
+  // other completion, such as early out). Note that if there is a main frame
+  // scheduled in that frame, then this BeginFrameArgs will become the main
+  // frame args. However, if no such frame is scheduled, then this _would_ be
+  // the main frame args if it was scheduled.
+  void RecordMainFrameTiming(
+      const BeginFrameArgs& start_of_main_frame_args,
+      const BeginFrameArgs& expected_next_main_frame_args);
+
  protected:
   LayerTreeHostImpl(
       const LayerTreeSettings& settings,
       LayerTreeHostImplClient* client,
       Proxy* proxy,
       RenderingStatsInstrumentation* rendering_stats_instrumentation,
       SharedBitmapManager* shared_bitmap_manager,
       gpu::GpuMemoryBufferManager* gpu_memory_buffer_manager,
       TaskGraphRunner* task_graph_runner,
       int id);
@@ skipping 210 matching lines @@
   scoped_ptr<FrameTimingTracker> frame_timing_tracker_;
 
   scoped_ptr<Viewport> viewport_;
 
   DISALLOW_COPY_AND_ASSIGN(LayerTreeHostImpl);
 };
 
 }  // namespace cc
 
 #endif  // CC_TREES_LAYER_TREE_HOST_IMPL_H_