cc: Make eviction queue building consistent with raster.

cc/resources/tile_manager.h

Index: cc/resources/tile_manager.h
diff --git a/cc/resources/tile_manager.h b/cc/resources/tile_manager.h
index e93373af653e44f5db4b82b7e3e56639e8e62ecc..9ca7aa2b613bcaf725193ef3dcd5538cb7f8cf0d 100644
--- a/cc/resources/tile_manager.h
+++ b/cc/resources/tile_manager.h
@@ -67,8 +67,8 @@ class CC_EXPORT TileManagerClient {
   // Given an empty eviction tile priority queue, this will build a priority
   // queue that will return tiles in order in which they should be evicted.
   // Note if the queue was previous built, Reset must be called on it.
-  virtual void BuildEvictionQueue(EvictionTilePriorityQueue* queue,
-                                  TreePriority tree_priority) = 0;
+  virtual scoped_ptr<EvictionTilePriorityQueue> BuildEvictionQueue(
+      TreePriority tree_priority) = 0;
 
  protected:
   virtual ~TileManagerClient() {}
@@ -305,8 +305,7 @@ class CC_EXPORT TileManager : public TileTaskRunnerClient,
   UniqueNotifier ready_to_draw_check_notifier_;
   UniqueNotifier more_tiles_need_prepare_check_notifier_;
 
-  EvictionTilePriorityQueue eviction_priority_queue_;
-  bool eviction_priority_queue_is_up_to_date_;
+  scoped_ptr<EvictionTilePriorityQueue> eviction_priority_queue_;
 
   bool did_notify_ready_to_activate_;
   bool did_notify_ready_to_draw_;