cc: Compute target space transform dynamically

cc/layers/layer.cc

 // Copyright 2010 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 "cc/layers/layer.h"
 
 #include <stddef.h>
 #include <stdint.h>
 
 #include <algorithm>
@@ skipping 963 matching lines @@
 
 int Layer::effect_tree_index() const {
   if (!layer_tree_host_ ||
       layer_tree_host_->property_trees()->sequence_number !=
           property_tree_sequence_number_) {
     return -1;
   }
   return effect_tree_index_;
 }
 
+int Layer::render_target_effect_tree_index() const {
+  EffectNode* effect_node =
+      layer_tree_host_->property_trees()->effect_tree.Node(effect_tree_index_);
+  if (effect_node->has_render_surface)
+    return effect_node->id;
+  else
+    return effect_node->target_id;
+}
+
 void Layer::SetScrollTreeIndex(int index) {
   DCHECK(IsPropertyChangeAllowed());
   if (scroll_tree_index_ == index)
     return;
   scroll_tree_index_ = index;
   SetNeedsPushProperties();
 }
 
 int Layer::scroll_tree_index() const {
   if (!layer_tree_host_ ||
@@ skipping 849 matching lines @@
       ->num_copy_requests_in_subtree;
 }
 
 gfx::Transform Layer::screen_space_transform() const {
   DCHECK_NE(transform_tree_index_, -1);
   return draw_property_utils::ScreenSpaceTransform(
       this, layer_tree_host_->property_trees()->transform_tree);
 }
 
 }  // namespace cc