Implement on demand quad rasterization for PicturePiles.

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 <list>
 
 #include "base/memory/scoped_ptr.h"
@@ skipping 58 matching lines @@
 
       void set_transparent() {
         mode_ = TRANSPARENT_MODE;
       }
 
       void set_solid_color(const SkColor& color) {
         mode_ = SOLID_COLOR_MODE;
         solid_color_ = color;
       }
 
+      void set_rasterize_on_demand() {
+        mode_ = PICTURE_PILE_MODE;
+      }
+
       Mode mode_;
       SkColor solid_color_;
 
       scoped_ptr<ResourcePool::Resource> resource_;
       bool resource_is_being_initialized_;
       bool can_be_freed_;
       bool contents_swizzled_;
   };
 
 
@@ skipping 19 matching lines @@
   // to determine policy.
   TileManagerBin gpu_memmgr_stats_bin;
   TileResolution resolution;
   float time_to_needed_in_seconds;
   float distance_to_visible_in_pixels;
 };
 
 }  // namespace cc
 
 #endif  // CC_RESOURCES_MANAGED_TILE_STATE_H_