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..2d4d1edc71d8b174e9c026ebd6ee16c84acb3626 100644
--- a/cc/layers/layer.h
+++ b/cc/layers/layer.h
@@ -252,7 +252,6 @@ class CC_EXPORT Layer : public base::RefCounted<Layer>,
   bool screen_space_opacity_is_animating() const {
     return draw_properties_.screen_space_opacity_is_animating;
   }
-  bool is_clipped() const { return draw_properties_.is_clipped; }
   gfx::Rect clip_rect() const { return draw_properties_.clip_rect; }
   gfx::Rect drawable_content_rect() const {
     return draw_properties_.drawable_content_rect;
@@ -500,6 +499,14 @@ class CC_EXPORT Layer : public base::RefCounted<Layer>,
     return should_flatten_transform_from_property_tree_;
   }
 
+  void set_is_clipped(bool is_clipped) {
+    if (is_clipped_ == is_clipped)
+      return;
+    is_clipped_ = is_clipped;
+    SetNeedsPushProperties();
+  }
+  bool is_clipped() const { return is_clipped_; }
+
   // 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 +705,7 @@ 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_ : 1;
   bool should_scroll_on_main_thread_ : 1;
   bool have_wheel_event_handlers_ : 1;
   bool have_scroll_event_handlers_ : 1;