cc: Track BeginMainFrame more precisely in CompositorTimingHistory.

cc/trees/thread_proxy.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_THREAD_PROXY_H_
 #define CC_TREES_THREAD_PROXY_H_
 
 #include <string>
 
 #include "base/memory/scoped_ptr.h"
@@ skipping 273 matching lines @@
   void SetDeferCommitsOnImpl(bool defer_commits) const override;
   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 SetNeedsCommitOnImpl() override;
   void SetNeedsRedrawOnImpl(const gfx::Rect& damage_rect) override;
-  void BeginMainFrameAbortedOnImpl(CommitEarlyOutReason reason) override;
-  void StartCommitOnImpl(CompletionEvent* completion) override;
+  void BeginMainFrameAbortedOnImpl(
+      CommitEarlyOutReason reason,
+      base::TimeTicks main_thread_start_time) override;
+  void StartCommitOnImpl(CompletionEvent* completion,
+                         base::TimeTicks main_thread_start_time) override;
 
   // Returns |true| if the request was actually sent, |false| if one was
   // already outstanding.
   bool SendCommitRequestToImplThreadIfNeeded(
       CommitPipelineStage required_stage);
 
   // Called on impl thread.
   struct SchedulerStateRequest;
 
   void InitializeImplOnImplThread(CompletionEvent* completion);
@@ skipping 20 matching lines @@
 
   base::WeakPtr<ThreadProxy> main_thread_weak_ptr_;
   base::WeakPtr<ThreadProxy> impl_thread_weak_ptr_;
 
   DISALLOW_COPY_AND_ASSIGN(ThreadProxy);
 };
 
 }  // namespace cc
 
 #endif  // CC_TREES_THREAD_PROXY_H_