cc: Compute mask draw properties directly

cc/trees/draw_property_utils.h

Index: cc/trees/draw_property_utils.h
diff --git a/cc/trees/draw_property_utils.h b/cc/trees/draw_property_utils.h
index 1b4fbcaea62cd91bee817343ec4be6a9d341b5dd..d7d171c01fe6ee8a4efc9f903f04ee9f414e89d3 100644
--- a/cc/trees/draw_property_utils.h
+++ b/cc/trees/draw_property_utils.h
@@ -77,6 +77,9 @@ void CC_EXPORT ComputeVisibleRects(LayerImpl* root_layer,
 void CC_EXPORT ComputeLayerDrawProperties(LayerImpl* layer,
                                           const PropertyTrees* property_trees);
 
+void CC_EXPORT ComputeMaskDrawProperties(LayerImpl* mask_layer,
+                                         const PropertyTrees* property_trees);
+
 void CC_EXPORT ComputeSurfaceDrawProperties(const PropertyTrees* property_trees,
                                             RenderSurfaceImpl* render_surface);