cc: Add tiling raster tile iterators.

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 51 matching lines @@
 
     bool contents_swizzled() const {
       DCHECK(resource_);
       return !PlatformColor::SameComponentOrder(resource_->format());
     }
 
     bool requires_resource() const {
       return mode_ == RESOURCE_MODE || mode_ == PICTURE_PILE_MODE;
     }
 
+    inline bool has_resource() const { return !!resource_; }
+
     size_t GPUMemoryUsageInBytes() const;
 
     void SetSolidColorForTesting(SkColor color) { set_solid_color(color); }
     void SetHasTextForTesting(bool has_text) { has_text_ = has_text; }
+    void SetResourceForTesting(scoped_ptr<ScopedResource> resource) {
+      resource_ = resource.Pass();
+    }
 
    private:
     friend class TileManager;
     friend class PrioritizedTileSet;
     friend class Tile;
     friend class ManagedTileState;
 
     void set_use_resource() { mode_ = RESOURCE_MODE; }
 
     void set_solid_color(const SkColor& color) {
@@ skipping 29 matching lines @@
   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_