cc : Stop pushing layers from hidden subtrees at commit

cc/layers/layer.h

Index: cc/layers/layer.h
diff --git a/cc/layers/layer.h b/cc/layers/layer.h
index 5b21f5bc78a9ce8e9ff439a7e3cb1a30ead2dec9..40113f734e9765f2003a556ee1e230ed6817c631 100644
--- a/cc/layers/layer.h
+++ b/cc/layers/layer.h
@@ -391,6 +391,10 @@ class CC_EXPORT Layer : public base::RefCounted<Layer> {
     return should_flatten_transform_from_property_tree_;
   }
 
+  void SetIsHidden(bool is_hidden);
+
+  bool is_hidden() const { return is_hidden_; }
+
   const gfx::Rect& visible_layer_rect_for_testing() const {
     return visible_layer_rect_;
   }
@@ -624,6 +628,7 @@ class CC_EXPORT Layer : public base::RefCounted<Layer> {
   gfx::Vector2dF offset_to_transform_parent_;
   bool should_flatten_transform_from_property_tree_ : 1;
   bool draws_content_ : 1;
+  bool is_hidden_ : 1;
   bool use_local_transform_for_backface_visibility_ : 1;
   bool should_check_backface_visibility_ : 1;
   bool force_render_surface_for_testing_ : 1;