cc:: Add RenderingStatsInstrumentation to manage collection of RenderingStats

cc/tile_manager.h

Index: cc/tile_manager.h
diff --git a/cc/tile_manager.h b/cc/tile_manager.h
index dd7e90b975aaed4ef32668592db0fc2806c18339..118b0e11aa4ec44b4ecb2ef42bba97fbe76b9f45 100644
--- a/cc/tile_manager.h
+++ b/cc/tile_manager.h
@@ -15,7 +15,7 @@
 #include "base/values.h"
 #include "cc/memory_history.h"
 #include "cc/picture_pile_impl.h"
-#include "cc/rendering_stats.h"
+#include "cc/rendering_stats_recorder.h"
 #include "cc/resource_pool.h"
 #include "cc/tile_priority.h"
 #include "cc/worker_pool.h"
@@ -106,6 +106,7 @@ class CC_EXPORT TileManager : public WorkerPoolClient {
   TileManager(TileManagerClient* client,
               ResourceProvider *resource_provider,
               size_t num_raster_threads,
+              RenderingStatsRecorder* rendering_stats_recorder,
               bool use_cheapess_estimator,
               bool use_color_estimator,
               bool prediction_benchmarking);
@@ -126,8 +127,6 @@ class CC_EXPORT TileManager : public WorkerPoolClient {
   void GetMemoryStats(size_t* memoryRequiredBytes,
                       size_t* memoryNiceToHaveBytes,
                       size_t* memoryUsedBytes) const;
-  void SetRecordRenderingStats(bool record_rendering_stats);
-  void GetRenderingStats(RenderingStats* stats);
   bool HasPendingWorkScheduled(WhichTree tree) const;
 
   const MemoryHistory::Entry& memory_stats_from_last_assign() const {
@@ -193,14 +192,16 @@ class CC_EXPORT TileManager : public WorkerPoolClient {
                             WhichTree tree);
   scoped_ptr<Value> GetMemoryRequirementsAsValue() const;
 
-  static void RunRasterTask(uint8* buffer,
-                            const gfx::Rect& rect,
-                            float contents_scale,
-                            const RasterTaskMetadata& metadata,
-                            PicturePileImpl* picture_pile,
-                            RenderingStats* stats);
-  static void RunImageDecodeTask(skia::LazyPixelRef* pixel_ref,
-                                 RenderingStats* stats);
+  static void RunRasterTask(
+      uint8* buffer,
+      const gfx::Rect& rect,
+      float contents_scale,
+      const RasterTaskMetadata& metadata,
+      RenderingStatsRecorder* stats_recorder,
+      PicturePileImpl* picture_pile);
+  static void RunImageDecodeTask(
+      skia::LazyPixelRef* pixel_ref,
+      RenderingStatsRecorder* stats_recorder);
 
   static void RecordCheapnessPredictorResults(bool is_predicted_cheap,
                                               bool is_actually_cheap);
@@ -239,8 +240,7 @@ class CC_EXPORT TileManager : public WorkerPoolClient {
   bool ever_exceeded_memory_budget_;
   MemoryHistory::Entry memory_stats_from_last_assign_;
 
-  bool record_rendering_stats_;
-  RenderingStats rendering_stats_;
+  RenderingStatsRecorder* rendering_stats_recorder_;
 
   bool use_cheapness_estimator_;
   bool use_color_estimator_;