Compute if a layer is clipped outside CalcDrawProps

cc/layers/layer.h

Index: cc/layers/layer.h
diff --git a/cc/layers/layer.h b/cc/layers/layer.h
index 3ff2810c9d630f30d7b24ca0b75f66a28a906f6c..e338a6abd0a7c5086336d31e4b4d9324abdd3c4e 100644
--- a/cc/layers/layer.h
+++ b/cc/layers/layer.h
@@ -500,6 +500,14 @@ class CC_EXPORT Layer : public base::RefCounted<Layer>,
     return should_flatten_transform_from_property_tree_;
   }
 
+  void set_is_clipped_from_property_tree(bool is_clipped) {
+    is_clipped_from_property_tree_ = is_clipped;
+    SetNeedsPushProperties();
+  }
+  bool is_clipped_from_property_tree() const {
+    return is_clipped_from_property_tree_;
+  }
+
   // TODO(vollick): These values are temporary and will be removed as soon as
   // render surface determinations are moved out of CDP. They only exist because
   // certain logic depends on whether or not a layer would render to a separate
@@ -698,6 +706,7 @@ class CC_EXPORT Layer : public base::RefCounted<Layer>,
   int num_children_with_scroll_parent_;
   gfx::Vector2dF offset_to_transform_parent_;
   bool should_flatten_transform_from_property_tree_ : 1;
+  bool is_clipped_from_property_tree_ : 1;
   bool should_scroll_on_main_thread_ : 1;
   bool have_wheel_event_handlers_ : 1;
   bool have_scroll_event_handlers_ : 1;