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

cc/test/fake_scrollbar_layer.h

 // Copyright 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CC_TEST_FAKE_SCROLLBAR_LAYER_H_
 #define CC_TEST_FAKE_SCROLLBAR_LAYER_H_
 
 #include "base/memory/scoped_ptr.h"
 #include "cc/layers/scrollbar_layer.h"
 
@@ skipping 11 matching lines @@
   int update_count() const { return update_count_; }
   void reset_update_count() { update_count_ = 0; }
   size_t last_update_full_upload_size() const {
     return last_update_full_upload_size_;
   }
   size_t last_update_partial_upload_size() const {
     return last_update_partial_upload_size_;
   }
 
   virtual void Update(ResourceUpdateQueue* queue,
-                      const OcclusionTracker* occlusion,
-                      RenderingStats* stats) OVERRIDE;
+                      const OcclusionTracker* occlusion) OVERRIDE;
 
  private:
   FakeScrollbarLayer(bool paint_during_update,
                      bool has_thumb,
                      int scrolling_layer_id);
   virtual ~FakeScrollbarLayer();
 
   int update_count_;
   size_t last_update_full_upload_size_;
   size_t last_update_partial_upload_size_;
 };
 
 }  // namespace cc
 
 #endif  // CC_TEST_FAKE_SCROLLBAR_LAYER_H_