cc: Track BeginMainFrame more precisely in CompositorTimingHistory.

cc/trees/threaded_channel.h

 // Copyright 2015 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_THREADED_CHANNEL_H_
 #define CC_TREES_THREADED_CHANNEL_H_
 
 #include "base/memory/ref_counted.h"
 #include "base/memory/scoped_ptr.h"
 #include "cc/base/cc_export.h"
@@ skipping 67 matching lines @@
   // ChannelMain Implementation
   void SetThrottleFrameProductionOnImpl(bool throttle) override;
   void UpdateTopControlsStateOnImpl(TopControlsState constraints,
                                     TopControlsState current,
                                     bool animate) override;
   void InitializeOutputSurfaceOnImpl(OutputSurface* output_surface) override;
   void MainThreadHasStoppedFlingingOnImpl() override;
   void SetInputThrottledUntilCommitOnImpl(bool is_throttled) override;
   void SetDeferCommitsOnImpl(bool defer_commits) override;
   void SetNeedsCommitOnImpl() override;
-  void BeginMainFrameAbortedOnImpl(CommitEarlyOutReason reason) override;
+  void BeginMainFrameAbortedOnImpl(
+      CommitEarlyOutReason reason,
+      base::TimeTicks main_thread_start_time) override;
   void SetNeedsRedrawOnImpl(const gfx::Rect& damage_rect) override;
 
   // Blocking calls to ProxyImpl
   void FinishAllRenderingOnImpl(CompletionEvent* completion) override;
   void SetVisibleOnImpl(CompletionEvent* completion, bool visible) override;
   void ReleaseOutputSurfaceOnImpl(CompletionEvent* completion) override;
   void FinishGLOnImpl(CompletionEvent* completion) override;
   void MainFrameWillHappenOnImplForTesting(
       CompletionEvent* completion,
       bool* main_frame_will_happen) override;
-  void StartCommitOnImpl(CompletionEvent* completion) override;
+  void StartCommitOnImpl(CompletionEvent* completion,
+                         base::TimeTicks main_thread_start_time) override;
 
   // ChannelImpl Implementation
   void DidCompleteSwapBuffers() override;
   void SetRendererCapabilitiesMainCopy(
       const RendererCapabilities& capabilities) override;
   void BeginMainFrameNotExpectedSoon() override;
   void DidCommitAndDrawFrame() override;
   void SetAnimationEvents(scoped_ptr<AnimationEventsVector> queue) override;
   void DidLoseOutputSurface() override;
   void RequestNewOutputSurface() override;
@@ skipping 30 matching lines @@
   scoped_refptr<base::SingleThreadTaskRunner> main_task_runner_;
 
   scoped_refptr<base::SingleThreadTaskRunner> impl_task_runner_;
 
   DISALLOW_COPY_AND_ASSIGN(ThreadedChannel);
 };
 
 }  // namespace cc
 
 #endif  // CC_TREES_THREADED_CHANNEL_H_