cc: Measure compositor timing with finer granularity

cc/trees/single_thread_proxy.h

Index: cc/trees/single_thread_proxy.h
diff --git a/cc/trees/single_thread_proxy.h b/cc/trees/single_thread_proxy.h
index 8cb5f6654fe864bd78cdf0990cbee78187d5d168..168fe8df986f23df42b3498100f683716e0691c3 100644
--- a/cc/trees/single_thread_proxy.h
+++ b/cc/trees/single_thread_proxy.h
@@ -15,7 +15,6 @@
 #include "cc/trees/blocking_task_runner.h"
 #include "cc/trees/layer_tree_host_impl.h"
 #include "cc/trees/proxy.h"
-#include "cc/trees/proxy_timing_history.h"
 
 namespace cc {
 
@@ -77,9 +76,6 @@ class CC_EXPORT SingleThreadProxy : public Proxy,
   void ScheduledActionPrepareTiles() override;
   void ScheduledActionInvalidateOutputSurface() override;
   void DidAnticipatedDrawTimeChange(base::TimeTicks time) override;
-  base::TimeDelta DrawDurationEstimate() override;
-  base::TimeDelta BeginMainFrameToCommitDurationEstimate() override;
-  base::TimeDelta CommitToActivateDurationEstimate() override;
   void SendBeginFramesToChildren(const BeginFrameArgs& args) override;
   void SendBeginMainFrameNotExpectedSoon() override;
 
@@ -110,6 +106,7 @@ class CC_EXPORT SingleThreadProxy : public Proxy,
   void PostDelayedAnimationTaskOnImplThread(const base::Closure& task,
                                             base::TimeDelta delay) override {}
   void DidActivateSyncTree() override;
+  void WillPrepareTiles() override;
   void DidPrepareTiles() override;
   void DidCompletePageScaleAnimationOnImplThread() override;
   void OnDrawForOutputSurface() override;
@@ -157,7 +154,6 @@ class CC_EXPORT SingleThreadProxy : public Proxy,
 
   // Accessed from both threads.
   scoped_ptr<Scheduler> scheduler_on_impl_thread_;
-  ProxyTimingHistory timing_history_;
 
   scoped_ptr<BlockingTaskRunner::CapturePostTasks> commit_blocking_task_runner_;
   scoped_ptr<ResourceUpdateQueue> queue_for_commit_;