Add fixed raster scale use counter histograms.

cc/layers/layer.cc

Index: cc/layers/layer.cc
diff --git a/cc/layers/layer.cc b/cc/layers/layer.cc
index 88f2036fc8038144880d9942efe97e02a48f7b59..85459e6de06c34faec2cc43fbca27ee977b40c1d 100644
--- a/cc/layers/layer.cc
+++ b/cc/layers/layer.cc
@@ -89,7 +89,8 @@ Layer::Layer()
       clip_parent_(nullptr),
       replica_layer_(nullptr),
       client_(nullptr),
-      num_unclipped_descendants_(0) {}
+      num_unclipped_descendants_(0),
+      has_will_change_transform_hint_(false) {}
 
 Layer::~Layer() {
   // Our parent should be holding a reference to us so there should be no
@@ -1210,6 +1211,8 @@ void Layer::PushPropertiesTo(LayerImpl* layer) {
   update_rect_.Union(layer->update_rect());
   layer->SetUpdateRect(update_rect_);
 
+  layer->set_has_will_change_transform_hint(has_will_change_transform_hint());
+
   // Reset any state that should be cleared for the next update.
   subtree_property_changed_ = false;
   update_rect_ = gfx::Rect();