telemetry: Refactored rasterize_and_record measurement.

cc/debug/rendering_stats_instrumentation.h

Index: cc/debug/rendering_stats_instrumentation.h
diff --git a/cc/debug/rendering_stats_instrumentation.h b/cc/debug/rendering_stats_instrumentation.h
index fcecb371cfb4bf497039c80c1dd6de04cd8022b7..4508600ea92d6a8f085c13abf43c2eeee8cb39c8 100644
--- a/cc/debug/rendering_stats_instrumentation.h
+++ b/cc/debug/rendering_stats_instrumentation.h
@@ -19,11 +19,11 @@ class CC_EXPORT RenderingStatsInstrumentation {
   virtual ~RenderingStatsInstrumentation();
 
   // Return current main thread rendering stats.
-  MainThreadRenderingStats GetMainThreadRenderingStats() {
+  const MainThreadRenderingStats& main_thread_rendering_stats() {
     return main_stats_;
   }
   // Return current impl thread rendering stats.
-  ImplThreadRenderingStats GetImplThreadRenderingStats() {
+  const ImplThreadRenderingStats& impl_thread_rendering_stats() {
     return impl_stats_;
   }
   // Return the accumulated, combined rendering stats.
@@ -36,15 +36,6 @@ class CC_EXPORT RenderingStatsInstrumentation {
   // clear current stats.
   void AccumulateAndClearImplThreadStats();
 
-  // Issue trace event for current main thread rendering stats.
-  void IssueTraceEventForMainThreadStats() {
-    main_stats_.IssueTraceEvent();
-  }
-  // Issue trace event for current impl thread rendering stats.
-  void IssueTraceEventForImplThreadStats() {
-    impl_stats_.IssueTraceEvent();
-  }
-
   // Read and write access to the record_rendering_stats_ flag is not locked to
   // improve performance. The flag is commonly turned off and hardly changes
   // it's value during runtime.
@@ -66,6 +57,7 @@ class CC_EXPORT RenderingStatsInstrumentation {
   RenderingStatsInstrumentation();
 
  private:
+  // TODO(ernstm): rename to *_thread_rendering_stats_*
   MainThreadRenderingStats main_stats_;
   MainThreadRenderingStats main_stats_accu_;
   ImplThreadRenderingStats impl_stats_;