Add fixed raster scale use counter histograms.

cc/layers/layer_impl.cc

Index: cc/layers/layer_impl.cc
diff --git a/cc/layers/layer_impl.cc b/cc/layers/layer_impl.cc
index 9b7f53277d3db9a06d03a8b6680943f3260e2049..5bbaf325c6f6ed2cb6458396d68a13cc8bb4a366 100644
--- a/cc/layers/layer_impl.cc
+++ b/cc/layers/layer_impl.cc
@@ -84,7 +84,8 @@ LayerImpl::LayerImpl(LayerTreeImpl* tree_impl, int id)
       mutable_properties_(MutableProperty::kNone),
       debug_info_(nullptr),
       scrolls_drawn_descendant_(false),
-      layer_or_descendant_has_touch_handler_(false) {
+      layer_or_descendant_has_touch_handler_(false),
+      has_will_change_transform_hint_(false) {
   DCHECK_GT(layer_id_, 0);
 
   DCHECK(layer_tree_impl_);
@@ -495,6 +496,8 @@ void LayerImpl::PushPropertiesTo(LayerImpl* layer) {
   if (owned_debug_info_)
     layer->SetDebugInfo(std::move(owned_debug_info_));
 
+  layer->set_has_will_change_transform_hint(has_will_change_transform_hint());
+
   // Reset any state that should be cleared for the next update.
   layer_property_changed_ = false;
   update_rect_ = gfx::Rect();
@@ -1270,6 +1273,9 @@ void LayerImpl::AsValueInto(base::trace_event::TracedValue* state) const {
   state->SetBoolean("has_animation_bounds",
                     layer_tree_impl_->HasAnimationThatInflatesBounds(this));
 
+  state->SetBoolean("has_will_change_transform_hint",
+                    has_will_change_transform_hint());
+
   gfx::BoxF box;
   if (LayerUtils::GetAnimationBounds(*this, &box))
     MathUtil::AddToTracedValue("animation_bounds", box, state);