cc: Abstract out proxy timing history

cc/trees/proxy_timing_history.h

Index: cc/trees/proxy_timing_history.h
diff --git a/cc/trees/proxy_timing_history.h b/cc/trees/proxy_timing_history.h
new file mode 100644
index 0000000000000000000000000000000000000000..92ef80f8f070b758a61bf184224708976e52f594
--- /dev/null
+++ b/cc/trees/proxy_timing_history.h
@@ -0,0 +1,40 @@
+// Copyright 2013 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"
+
+namespace cc {
+
+class ProxyTimingHistory {
+ public:
+  ProxyTimingHistory();
+  ~ProxyTimingHistory();
+
+  base::TimeDelta DrawDurationEstimate() const;
+  base::TimeDelta BeginMainFrameToCommitDurationEstimate() const;
+  base::TimeDelta CommitToActivateDurationEstimate() const;
+
+  void DidBeginMainFrame();
+  void DidCommit();
+  void DidActivatePendingTree();
+  void DidStartDrawing();
+  // Returns draw duration.
+  base::TimeDelta DidFinishDrawing();
+
+ protected:
+  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_;
+};
+
+}  // namespace cc
+
+#endif  // CC_TREES_PROXY_TIMING_HISTORY_H_