cc: Switch RenderingStats collection in Layer::Update() to RenderingStatsInstrumentation

cc/debug/rendering_stats_instrumentation.cc

Index: cc/debug/rendering_stats_instrumentation.cc
diff --git a/cc/debug/rendering_stats_instrumentation.cc b/cc/debug/rendering_stats_instrumentation.cc
index 1fb5296b9ffb0b95596019f9e727e07a911766fa..e14e65f49f604bd54b90a5ff2a07f491fad68a22 100644
--- a/cc/debug/rendering_stats_instrumentation.cc
+++ b/cc/debug/rendering_stats_instrumentation.cc
@@ -36,14 +36,6 @@ base::TimeDelta RenderingStatsInstrumentation::EndRecording(
   return base::TimeDelta();
 }
 
-void RenderingStatsInstrumentation::AddStats(const RenderingStats& other) {
-  if (!record_rendering_stats_)
-    return;
-
-  base::AutoLock scoped_lock(lock_);
-  rendering_stats_.Add(other);
-}
-
 void RenderingStatsInstrumentation::IncrementAnimationFrameCount() {
   if (!record_rendering_stats_)
     return;