cc: Improve frame/commit accounting

cc/CCLayerTreeHostImpl.cpp

Index: cc/CCLayerTreeHostImpl.cpp
diff --git a/cc/CCLayerTreeHostImpl.cpp b/cc/CCLayerTreeHostImpl.cpp
index 5b1a23d67c4849142e87a75153fb473335e1f628..640f43d37a426abbfd1c0ac4bd6c9ddfff489749 100644
--- a/cc/CCLayerTreeHostImpl.cpp
+++ b/cc/CCLayerTreeHostImpl.cpp
@@ -129,6 +129,7 @@ CCLayerTreeHostImpl::CCLayerTreeHostImpl(const CCLayerTreeSettings& settings, CC
     , m_hasTransparentBackground(false)
     , m_needsAnimateLayers(false)
     , m_pinchGestureActive(false)
+    , m_numAnimationFrames(0)
     , m_fpsCounter(CCFrameRateCounter::create())
     , m_debugRectHistory(CCDebugRectHistory::create())
     , m_numImplThreadScrolls(0)
@@ -1230,6 +1231,7 @@ void CCLayerTreeHostImpl::animateLayers(double monotonicTime, double wallClockTi
     if (!CCSettings::acceleratedAnimationEnabled() || !m_needsAnimateLayers || !m_rootLayerImpl)
         return;
 
+    m_numAnimationFrames++;
     TRACE_EVENT0("cc", "CCLayerTreeHostImpl::animateLayers");
 
     OwnPtr<CCAnimationEventsVector> events(adoptPtr(new CCAnimationEventsVector));
@@ -1305,9 +1307,9 @@ int CCLayerTreeHostImpl::sourceAnimationFrameNumber() const
 void CCLayerTreeHostImpl::renderingStats(CCRenderingStats* stats) const
 {
     stats->numFramesSentToScreen = fpsCounter()->currentFrameNumber();
-    stats->droppedFrameCount = fpsCounter()->droppedFrameCount();
     stats->numImplThreadScrolls = m_numImplThreadScrolls;
     stats->numMainThreadScrolls = m_numMainThreadScrolls;
+    stats->numAnimationFramesImpl = m_numAnimationFrames;
 }
 
 void CCLayerTreeHostImpl::animateScrollbars(double monotonicTime)