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

cc/layers/scrollbar_layer.h

Index: cc/layers/scrollbar_layer.h
diff --git a/cc/layers/scrollbar_layer.h b/cc/layers/scrollbar_layer.h
index eafdde851e5f56322a780a8b6f516a87db1cc7eb..7b2b1c00415ffd90beb93553599c77e88c30cf79 100644
--- a/cc/layers/scrollbar_layer.h
+++ b/cc/layers/scrollbar_layer.h
@@ -40,8 +40,7 @@ class CC_EXPORT ScrollbarLayer : public ContentsScalingLayer {
   virtual void SetTexturePriorities(const PriorityCalculator& priority_calc)
       OVERRIDE;
   virtual void Update(ResourceUpdateQueue* queue,
-                      const OcclusionTracker* occlusion,
-                      RenderingStats* stats) OVERRIDE;
+                      const OcclusionTracker* occlusion) OVERRIDE;
   virtual void SetLayerTreeHost(LayerTreeHost* host) OVERRIDE;
   virtual void PushPropertiesTo(LayerImpl* layer) OVERRIDE;
   virtual void CalculateContentsScale(float ideal_contents_scale,
@@ -64,8 +63,7 @@ class CC_EXPORT ScrollbarLayer : public ContentsScalingLayer {
   void UpdatePart(CachingBitmapContentLayerUpdater* painter,
                   LayerUpdater::Resource* resource,
                   gfx::Rect rect,
-                  ResourceUpdateQueue* queue,
-                  RenderingStats* stats);
+                  ResourceUpdateQueue* queue);
   void CreateUpdaterIfNeeded();
   gfx::Rect ScrollbarLayerRectToContentRect(gfx::Rect layer_rect) const;