cc : Fix transform calculation bug while calculating clip rects

cc/trees/property_tree.cc

 // 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.
 
 #include <stddef.h>
 
 #include <set>
 #include <vector>
 
 #include "base/logging.h"
@@ skipping 2102 matching lines @@
   gfx::Transform screen_space_transform = transform_tree.ToScreen(transform_id);
   const EffectNode* effect_node = effect_tree.Node(effect_id);
 
   if (effect_node->surface_contents_scale.x() != 0.0 &&
       effect_node->surface_contents_scale.y() != 0.0)
     screen_space_transform.Scale(1.0 / effect_node->surface_contents_scale.x(),
                                  1.0 / effect_node->surface_contents_scale.y());
   return screen_space_transform;
 }
 
-bool PropertyTrees::ComputeTransformFromTarget(
-    int transform_id,
-    int effect_id,
-    gfx::Transform* transform) const {
-  transform->MakeIdentity();
-  if (transform_id == TransformTree::kInvalidNodeId)
-    return true;
-
-  const EffectNode* effect_node = effect_tree.Node(effect_id);
-
-  bool success = GetFromTarget(transform_id, effect_id, transform);
-  transform->Scale(effect_node->surface_contents_scale.x(),
-                   effect_node->surface_contents_scale.y());
-  return success;
-}
-
 }  // namespace cc