Compute if a layer is clipped outside CalcDrawProps

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 3635a3ab53aea9abef6145aecb6e546732ab13d1..702ac61260b3d491d48986c9584f7cfc5c793ea8 100644
--- a/cc/layers/layer_impl.h
+++ b/cc/layers/layer_impl.h
@@ -183,6 +183,14 @@ class CC_EXPORT LayerImpl : public LayerAnimationValueObserver,
     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_;
+  }
+
   void UpdatePropertyTreeTransform();
   void UpdatePropertyTreeOpacity();
   void UpdatePropertyTreeScrollOffset();
@@ -764,6 +772,7 @@ class CC_EXPORT LayerImpl : public LayerAnimationValueObserver,
   bool double_sided_ : 1;
   bool should_flatten_transform_ : 1;
   bool should_flatten_transform_from_property_tree_ : 1;
+  bool is_clipped_from_property_tree_ : 1;
 
   // Tracks if drawing-related properties have changed since last redraw.
   bool layer_property_changed_ : 1;