cc : Fix occlusion tracking bug for contributing surface

cc/trees/draw_property_utils.h

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CC_TREES_DRAW_PROPERTY_UTILS_H_
 #define CC_TREES_DRAW_PROPERTY_UTILS_H_
 
 #include "cc/base/cc_export.h"
 #include "cc/layers/layer_collections.h"
 
@@ skipping 10 matching lines @@
 class Layer;
 class LayerImpl;
 class LayerTreeHost;
 class RenderSurfaceImpl;
 class EffectTree;
 class TransformTree;
 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,
                             const TransformTree& transform_tree,
                             bool non_root_surfaces_enabled);
 
 // Computes combined (screen space) transforms for every node in the transform
 // tree. This must be done prior to calling |ComputeClips|.
 void CC_EXPORT ComputeTransforms(TransformTree* transform_tree);
 
@@ skipping 89 matching lines @@
 
 void CC_EXPORT
 UpdateElasticOverscroll(PropertyTrees* property_trees,
                         const Layer* overscroll_elasticity_layer,
                         const gfx::Vector2dF& elastic_overscroll);
 
 }  // namespace draw_property_utils
 }  // namespace cc
 
 #endif  // CC_TREES_DRAW_PROPERTY_UTILS_H_