cc: Directly use property trees to calculate clip rect

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 80 matching lines @@
                                     const EffectTree& effect_tree);
 
 bool CC_EXPORT LayerNeedsUpdate(Layer* layer,
                                 bool layer_is_drawn,
                                 const TransformTree& tree);
 
 bool CC_EXPORT LayerNeedsUpdate(LayerImpl* layer,
                                 bool layer_is_drawn,
                                 const TransformTree& tree);
 
+void CC_EXPORT VerifyClipTreeCalculations(const LayerImplList& layer_list,
+                                          PropertyTrees* property_trees);
+
 gfx::Transform CC_EXPORT DrawTransform(const LayerImpl* layer,
                                        const TransformTree& tree);
 
 gfx::Transform CC_EXPORT ScreenSpaceTransform(const Layer* layer,
                                               const TransformTree& tree);
 
 gfx::Transform CC_EXPORT ScreenSpaceTransform(const LayerImpl* layer,
                                               const TransformTree& tree);
 
 void CC_EXPORT UpdatePageScaleFactor(PropertyTrees* property_trees,
@@ skipping 15 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_