Add average commit time to perf tests.

cc/CCThreadProxy.cpp

Index: cc/CCThreadProxy.cpp
diff --git a/cc/CCThreadProxy.cpp b/cc/CCThreadProxy.cpp
index 26e734b8565f09e63fa789d162a0a7a20bb3cbdd..ac7696c738efcb6cde64aad3cd0984db6ab31732 100644
--- a/cc/CCThreadProxy.cpp
+++ b/cc/CCThreadProxy.cpp
@@ -62,6 +62,8 @@ CCThreadProxy::CCThreadProxy(CCLayerTreeHost* layerTreeHost)
     , m_resetContentsTexturesPurgedAfterCommitOnImplThread(false)
     , m_nextFrameIsNewlyCommittedFrameOnImplThread(false)
     , m_renderVSyncEnabled(layerTreeHost->settings().renderVSyncEnabled)
+    , m_totalCommitTime(0)
+    , m_totalCommitCount(0)
 {
     TRACE_EVENT0("cc", "CCThreadProxy::CCThreadProxy");
     ASSERT(isMainThread());
@@ -249,15 +251,18 @@ bool CCThreadProxy::recreateContext()
     return recreateSucceeded;
 }
 
-void CCThreadProxy::implSideRenderingStats(CCRenderingStats& stats)
+void CCThreadProxy::renderingStats(CCRenderingStats& stats)
 {
     ASSERT(isMainThread());
 
     DebugScopedSetMainThreadBlocked mainThreadBlocked;
     CCCompletionEvent completion;
-    CCProxy::implThread()->postTask(createCCThreadTask(this, &CCThreadProxy::implSideRenderingStatsOnImplThread,
+    CCProxy::implThread()->postTask(createCCThreadTask(this, &CCThreadProxy::renderingStatsOnImplThread,
                                                        &completion,
                                                        &stats));
+    stats.totalCommitTimeInSeconds = m_totalCommitTime;
+    stats.totalCommitCount = m_totalCommitCount;
+
     completion.wait();
 }
 
@@ -555,11 +560,18 @@ void CCThreadProxy::beginFrame()
     // coordinated by the CCScheduler.
     {
         TRACE_EVENT0("cc", "commit");
+
         DebugScopedSetMainThreadBlocked mainThreadBlocked;
 
+        double startTime = WTF::monotonicallyIncreasingTime();
         CCCompletionEvent completion;
         CCProxy::implThread()->postTask(createCCThreadTask(this, &CCThreadProxy::beginFrameCompleteOnImplThread, &completion, queue.release(), request->contentsTexturesWereDeleted));
         completion.wait();
+        double endTime = WTF::monotonicallyIncreasingTime();
+
+        double commitTime = endTime - startTime;
+        m_totalCommitTime += commitTime;
+        m_totalCommitCount++;
     }
 
     m_layerTreeHost->commitComplete();
@@ -914,7 +926,7 @@ void CCThreadProxy::recreateContextOnImplThread(CCCompletionEvent* completion, C
     completion->signal();
 }
 
-void CCThreadProxy::implSideRenderingStatsOnImplThread(CCCompletionEvent* completion, CCRenderingStats* stats)
+void CCThreadProxy::renderingStatsOnImplThread(CCCompletionEvent* completion, CCRenderingStats* stats)
 {
     ASSERT(isImplThread());
     m_layerTreeHostImpl->renderingStats(*stats);