cc: Simplify picture layer tiling update tile priorities.

cc/resources/managed_tile_state.h

 // Copyright 2013 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_RESOURCES_MANAGED_TILE_STATE_H_
 #define CC_RESOURCES_MANAGED_TILE_STATE_H_
 
 #include "base/memory/scoped_ptr.h"
 #include "cc/resources/platform_color.h"
 #include "cc/resources/raster_worker_pool.h"
@@ skipping 93 matching lines @@
   scoped_ptr<base::Value> AsValue() const;
 
   // Persisted state: valid all the time.
   TileVersion tile_versions[NUM_RASTER_MODES];
   RasterMode raster_mode;
 
   ManagedTileBin bin;
 
   TileResolution resolution;
   bool required_for_activation;
-  float time_to_needed_in_seconds;
-  float distance_to_visible_in_pixels;
+  TilePriority::PriorityBin priority_bin;
+  float distance_to_visible;
   bool visible_and_ready_to_draw;
 
   // Priority for this state from the last time we assigned memory.
   unsigned scheduled_priority;
 };
 
 }  // namespace cc
 
 #endif  // CC_RESOURCES_MANAGED_TILE_STATE_H_