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..b4502227e7bd1e8cc554989c3b2eef5b4f4afa52 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 PostConcatSublayerScale(const int effect_node_id,
+                                       const EffectTree& effect_tree,
+                                       gfx::Transform* transform);
+
+void CC_EXPORT ConcatInverseSublayerScale(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,