Add fixed raster scale use counter histograms.

cc/layers/layer_impl.h

Index: cc/layers/layer_impl.h
diff --git a/cc/layers/layer_impl.h b/cc/layers/layer_impl.h
index c4795d0996e1ac36e97a06ff3469c3bf75b1c775..24dc053ef962117470cfd811b27c9534e73f6ba7 100644
--- a/cc/layers/layer_impl.h
+++ b/cc/layers/layer_impl.h
@@ -524,6 +524,11 @@ class CC_EXPORT LayerImpl {
 
   void ClearLinksToOtherLayers();
 
+  void SetHasWillChangeTransformHint(bool has_will_change);
+  bool has_will_change_transform_hint() const {
+    return has_will_change_transform_hint_;
+  }
+
  protected:
   LayerImpl(LayerTreeImpl* layer_impl,
             int id,
@@ -661,6 +666,7 @@ class CC_EXPORT LayerImpl {
   bool scrolls_drawn_descendant_;
   // If true, the layer or one of its descendants has a touch handler.
   bool layer_or_descendant_has_touch_handler_;
+  bool has_will_change_transform_hint_;
 
   DISALLOW_COPY_AND_ASSIGN(LayerImpl);
 };