cc: Measure compositor timing with finer granularity

cc/trees/proxy_timing_history.h

-// Copyright 2014 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_PROXY_TIMING_HISTORY_H_
-#define CC_TREES_PROXY_TIMING_HISTORY_H_
-
-#include "cc/base/rolling_time_delta_history.h"
-#include "cc/debug/rendering_stats_instrumentation.h"
-
-namespace cc {
-
-class ProxyTimingHistory {
- public:
-  explicit ProxyTimingHistory(
-      RenderingStatsInstrumentation* rendering_stats_instrumentation);
-  ~ProxyTimingHistory();
-
-  base::TimeDelta DrawDurationEstimate() const;
-  base::TimeDelta BeginMainFrameToCommitDurationEstimate() const;
-  base::TimeDelta CommitToActivateDurationEstimate() const;
-
-  void DidBeginMainFrame();
-  void DidCommit();
-  void DidActivateSyncTree();
-  void DidStartDrawing();
-  void DidFinishDrawing();
-
- protected:
-  void AddDrawDurationUMA(base::TimeDelta draw_duration,
-                          base::TimeDelta draw_duration_estimate);
-
-  RollingTimeDeltaHistory draw_duration_history_;
-  RollingTimeDeltaHistory begin_main_frame_to_commit_duration_history_;
-  RollingTimeDeltaHistory commit_to_activate_duration_history_;
-
-  base::TimeTicks begin_main_frame_sent_time_;
-  base::TimeTicks commit_complete_time_;
-  base::TimeTicks start_draw_time_;
-
-  RenderingStatsInstrumentation* rendering_stats_instrumentation_;
-};
-
-}  // namespace cc
-
-#endif  // CC_TREES_PROXY_TIMING_HISTORY_H_