cc: Make eviction queue building consistent with raster.

cc/trees/layer_tree_host_impl.cc

 // Copyright 2011 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/trees/layer_tree_host_impl.h"
 
 #include <algorithm>
 #include <limits>
 
 #include "base/basictypes.h"
@@ skipping 1201 matching lines @@
     // then we will miss telling the scheduler each frame that we intend to draw
     // so it may make worse scheduling decisions.
     required_for_draw_tile_is_top_of_raster_queue_ =
         queue->Top()->required_for_draw();
   } else {
     required_for_draw_tile_is_top_of_raster_queue_ = false;
   }
   return queue;
 }
 
-void LayerTreeHostImpl::BuildEvictionQueue(EvictionTilePriorityQueue* queue,
-                                           TreePriority tree_priority) {
+scoped_ptr<EvictionTilePriorityQueue> LayerTreeHostImpl::BuildEvictionQueue(
+    TreePriority tree_priority) {
   TRACE_EVENT0("cc", "LayerTreeHostImpl::BuildEvictionQueue");
+  scoped_ptr<EvictionTilePriorityQueue> queue(new EvictionTilePriorityQueue);
   picture_layer_pairs_.clear();
   GetPictureLayerImplPairs(&picture_layer_pairs_, false);
   queue->Build(picture_layer_pairs_, tree_priority);
+  return queue;
 }
 
 const std::vector<PictureLayerImpl*>& LayerTreeHostImpl::GetPictureLayers()
     const {
   return picture_layers_;
 }
 
 void LayerTreeHostImpl::NotifyReadyToActivate() {
   client_->NotifyReadyToActivate();
 }
@@ skipping 2220 matching lines @@
 }
 
 void LayerTreeHostImpl::UnregisterPictureLayerImpl(PictureLayerImpl* layer) {
   std::vector<PictureLayerImpl*>::iterator it =
       std::find(picture_layers_.begin(), picture_layers_.end(), layer);
   DCHECK(it != picture_layers_.end());
   picture_layers_.erase(it);
 }
 
 }  // namespace cc