cc:: Add RenderingStatsInstrumentation to manage collection of RenderingStats

cc/resources/raster_worker_pool.cc

Index: cc/resources/raster_worker_pool.cc
diff --git a/cc/resources/raster_worker_pool.cc b/cc/resources/raster_worker_pool.cc
index 369a0e525149d1216794eb8006551725848ad9d9..c2a4a0b87a17232c159b34f148bcf1d37fcbdc15 100644
--- a/cc/resources/raster_worker_pool.cc
+++ b/cc/resources/raster_worker_pool.cc
@@ -25,14 +25,12 @@ class RasterWorkerPoolTaskImpl : public internal::WorkerPoolTask {
 
   virtual bool IsCheap() OVERRIDE { return is_cheap_; }
 
-  virtual void Run(RenderingStats* rendering_stats) OVERRIDE {
-    task_.Run(picture_pile_.get(), rendering_stats);
+  virtual void Run() OVERRIDE {
+    task_.Run(picture_pile_.get());
   }
 
-  virtual void RunOnThread(
-      RenderingStats* rendering_stats, unsigned thread_index) OVERRIDE {
-    task_.Run(picture_pile_->GetCloneForDrawingOnThread(thread_index),
-              rendering_stats);
+  virtual void RunOnThread(unsigned thread_index) OVERRIDE {
+    task_.Run(picture_pile_->GetCloneForDrawingOnThread(thread_index));
   }
 
  private: