cc : Fix occlusion tracking bug for contributing surface

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 443e6cd2799271fd28e10602be7c9c90787627a0..875d2c72d3c440d4735354e70e7b88212260be5e 100644
--- a/cc/trees/draw_property_utils.h
+++ b/cc/trees/draw_property_utils.h
@@ -28,6 +28,13 @@ class PropertyTrees;
 
 namespace draw_property_utils {
 
+void CC_EXPORT ApplySublayerScale(const int effect_node_id,
+                                  const EffectTree& effect_tree,
+                                  gfx::Transform* transform);
+
+void CC_EXPORT RemoveSublayerScale(const int effect_node_id,
+                                   const EffectTree& effect_tree,
+                                   gfx::Transform* transform);
 // Computes combined clips for every node in |clip_tree|. This function requires
 // that |transform_tree| has been updated via |ComputeTransforms|.
 void CC_EXPORT ComputeClips(ClipTree* clip_tree,