cc:: Add RenderingStatsInstrumentation to manage collection of RenderingStats

cc/thread_proxy.cc

Index: cc/thread_proxy.cc
diff --git a/cc/thread_proxy.cc b/cc/thread_proxy.cc
index 139eddcc6c8eea4c38eec9b5f18809ddaffb3353..63a46afc027ed5aa197fcb991692eca234cab1f6 100644
--- a/cc/thread_proxy.cc
+++ b/cc/thread_proxy.cc
@@ -58,7 +58,6 @@ ThreadProxy::ThreadProxy(LayerTreeHost* layerTreeHost, scoped_ptr<Thread> implTh
     , m_nextFrameIsNewlyCommittedFrameOnImplThread(false)
     , m_renderVSyncEnabled(layerTreeHost->settings().renderVSyncEnabled)
     , m_insideDraw(false)
-    , m_totalCommitCount(0)
     , m_deferCommits(false)
     , m_renewTreePriorityOnImplThreadPending(false)
 {
@@ -255,20 +254,6 @@ bool ThreadProxy::RecreateOutputSurface()
     return recreateSucceeded;
 }
 
-void ThreadProxy::GetRenderingStats(RenderingStats* stats)
-{
-    DCHECK(IsMainThread());
-
-    DebugScopedSetMainThreadBlocked mainThreadBlocked(this);
-    CompletionEvent completion;
-    Proxy::ImplThread()->postTask(base::Bind(&ThreadProxy::renderingStatsOnImplThread,
-                                             m_implThreadWeakPtr,  &completion, stats));
-    stats->totalCommitTime = m_totalCommitTime;
-    stats->totalCommitCount = m_totalCommitCount;
-
-    completion.wait();
-}
-
 const RendererCapabilities& ThreadProxy::GetRendererCapabilities() const
 {
     DCHECK(m_rendererInitialized);
@@ -691,14 +676,15 @@ void ThreadProxy::beginFrame(scoped_ptr<BeginFrameAndCommitState> beginFrameStat
 
         DebugScopedSetMainThreadBlocked mainThreadBlocked(this);
 
-        base::TimeTicks startTime = base::TimeTicks::HighResNow();
+        RenderingStatsRecorder* statsRecorder = m_layerTreeHost->renderingStatsRecorder();
+        base::TimeTicks startTime = statsRecorder->StartRecording();
+
         CompletionEvent completion;
         Proxy::ImplThread()->postTask(base::Bind(&ThreadProxy::beginFrameCompleteOnImplThread, m_implThreadWeakPtr, &completion, queue.release(), offscreenContextProvider));
         completion.wait();
-        base::TimeTicks endTime = base::TimeTicks::HighResNow();
 
-        m_totalCommitTime += endTime - startTime;
-        m_totalCommitCount++;
+        base::TimeDelta duration = statsRecorder->EndRecording(startTime);
+        statsRecorder->AddCommit(duration);
     }
 
     m_layerTreeHost->commitComplete();
@@ -1088,13 +1074,6 @@ void ThreadProxy::recreateOutputSurfaceOnImplThread(CompletionEvent* completion,
     completion->signal();
 }
 
-void ThreadProxy::renderingStatsOnImplThread(CompletionEvent* completion, RenderingStats* stats)
-{
-    DCHECK(IsImplThread());
-    m_layerTreeHostImpl->renderingStats(stats);
-    completion->signal();
-}
-
 ThreadProxy::BeginFrameAndCommitState::BeginFrameAndCommitState()
     : memoryAllocationLimitBytes(0)
 {