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

cc/trees/layer_tree_host_unittest.cc

Index: cc/trees/layer_tree_host_unittest.cc
diff --git a/cc/trees/layer_tree_host_unittest.cc b/cc/trees/layer_tree_host_unittest.cc
index da2d89147cd86724b004e66a0dff7c4769557656..c131febdfc39c2345a95102c3ba02b4ab9d51c42 100644
--- a/cc/trees/layer_tree_host_unittest.cc
+++ b/cc/trees/layer_tree_host_unittest.cc
@@ -563,9 +563,8 @@ class ContentLayerWithUpdateTracking : public ContentLayer {
   void ResetPaintContentsCount() { paint_contents_count_ = 0; }
 
   virtual void Update(ResourceUpdateQueue* queue,
-                      const OcclusionTracker* occlusion,
-                      RenderingStats* stats) OVERRIDE {
-    ContentLayer::Update(queue, occlusion, stats);
+                      const OcclusionTracker* occlusion) OVERRIDE {
+    ContentLayer::Update(queue, occlusion);
     paint_contents_count_++;
   }
 
@@ -1230,8 +1229,7 @@ class EvictionTestLayer : public Layer {
   }
 
   virtual void Update(ResourceUpdateQueue*,
-                      const OcclusionTracker*,
-                      RenderingStats*) OVERRIDE;
+                      const OcclusionTracker*) OVERRIDE;
   virtual bool DrawsContent() const OVERRIDE { return true; }
 
   virtual scoped_ptr<LayerImpl> CreateLayerImpl(LayerTreeImpl* tree_impl)
@@ -1291,8 +1289,7 @@ void EvictionTestLayer::SetTexturePriorities(const PriorityCalculator&) {
 }
 
 void EvictionTestLayer::Update(ResourceUpdateQueue* queue,
-                               const OcclusionTracker*,
-                               RenderingStats*) {
+                               const OcclusionTracker*) {
   CreateTextureIfNeeded();
   if (!texture_.get())
     return;