cc: Improve frame/commit accounting

cc/single_thread_proxy.cc

Index: cc/single_thread_proxy.cc
diff --git a/cc/single_thread_proxy.cc b/cc/single_thread_proxy.cc
index e9ac8e79f92d44d744be6fe5bf9e20e12927982a..de27220be4c98a8e86e6970cb610d47bf9234b2c 100644
--- a/cc/single_thread_proxy.cc
+++ b/cc/single_thread_proxy.cc
@@ -7,6 +7,7 @@
 #include "CCSingleThreadProxy.h"
 
 #include "CCDrawQuad.h"
+#include "CCFrameRateCounter.h"
 #include "CCGraphicsContext.h"
 #include "CCLayerTreeHost.h"
 #include "CCTextureUpdateController.h"
@@ -117,6 +118,7 @@ bool CCSingleThreadProxy::initializeRenderer()
         if (ok) {
             m_rendererInitialized = true;
             m_RendererCapabilitiesForMainThread = m_layerTreeHostImpl->rendererCapabilities();
+            onVSyncParametersChanged(0, 1.0/60.0);
         }
 
         return ok;
@@ -310,6 +312,14 @@ void CCSingleThreadProxy::onSwapBuffersCompleteOnImplThread()
     ASSERT_NOT_REACHED();
 }
 
+void CCSingleThreadProxy::onVSyncParametersChanged(double monotonicTimebase, double intervalInSeconds)
+{
+    TRACE_EVENT2("cc", "CCSingleThreadProxy::onVSyncParametersChanged", "monotonicTimebase", monotonicTimebase, "intervalInSeconds", intervalInSeconds);
+    base::TimeTicks timebase = base::TimeTicks::FromInternalValue(monotonicTimebase * base::Time::kMicrosecondsPerSecond);
+    base::TimeDelta interval = base::TimeDelta::FromMicroseconds(intervalInSeconds * base::Time::kMicrosecondsPerSecond);
+    m_layerTreeHostImpl->fpsCounter()->setTimebaseAndInterval(timebase, interval);
+}
+
 bool CCSingleThreadProxy::commitAndComposite()
 {
     ASSERT(CCProxy::isMainThread());