cc: Associate scheduled tasks with a prepare tiles call.

cc/tiles/tile_manager.h

 // Copyright 2012 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_TILES_TILE_MANAGER_H_
 #define CC_TILES_TILE_MANAGER_H_
 
 #include <deque>
 #include <queue>
 #include <set>
@@ skipping 303 matching lines @@
   UniqueNotifier ready_to_activate_check_notifier_;
   UniqueNotifier ready_to_draw_check_notifier_;
   UniqueNotifier all_tile_tasks_completed_check_notifier_;
   UniqueNotifier more_tiles_need_prepare_check_notifier_;
 
   bool did_notify_ready_to_activate_;
   bool did_notify_ready_to_draw_;
   bool did_notify_all_tile_tasks_completed_;
   bool has_scheduled_tile_tasks_;
 
+  uint64_t prepare_tiles_count_;
+
   DISALLOW_COPY_AND_ASSIGN(TileManager);
 };
 
 }  // namespace cc
 
 #endif  // CC_TILES_TILE_MANAGER_H_