cc: RenderingStats overhaul

cc/trees/thread_proxy.cc

Index: cc/trees/thread_proxy.cc
diff --git a/cc/trees/thread_proxy.cc b/cc/trees/thread_proxy.cc
index a0bd4bf5a7ec5683538de97e89b854786ade959a..31a497ab267419fb189fadd24095c8e57df86438 100644
--- a/cc/trees/thread_proxy.cc
+++ b/cc/trees/thread_proxy.cc
@@ -695,6 +695,7 @@ void ThreadProxy::BeginFrameOnMainThread(
     scoped_ptr<BeginFrameAndCommitState> begin_frame_state) {
   TRACE_EVENT0("cc", "ThreadProxy::BeginFrameOnMainThread");
   DCHECK(IsMainThread());
+
   if (!layer_tree_host_)
     return;
 
@@ -816,7 +817,7 @@ void ThreadProxy::BeginFrameOnMainThread(
   // point of view, but asynchronously performed on the impl thread,
   // coordinated by the Scheduler.
   {
-    TRACE_EVENT0("cc", "ThreadProxy::BeginFrameOnMainThread::commit");
+    TRACE_EVENT_BEGIN0("cc", "ThreadProxy::BeginFrameOnMainThread::commit");
 
     DebugScopedSetMainThreadBlocked main_thread_blocked(this);
 
@@ -836,6 +837,10 @@ void ThreadProxy::BeginFrameOnMainThread(
 
     base::TimeDelta duration = stats_instrumentation->EndRecording(start_time);
     stats_instrumentation->AddCommit(duration);
+    TRACE_EVENT_END1("cc", "ThreadProxy::BeginFrameOnMainThread::commit",
+                     "data", stats_instrumentation->
+                     GetMainThreadRenderingStats().AsTraceableData());
+    stats_instrumentation->AccumulateAndClearMainThreadStats();
   }
 
   layer_tree_host_->CommitComplete();