Support different formats in the same resource pool.

cc/resources/tile.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_RESOURCES_TILE_H_
 #define CC_RESOURCES_TILE_H_
 
 #include "base/memory/ref_counted.h"
 #include "cc/base/ref_counted_managed.h"
 #include "cc/resources/raster_source.h"
 #include "cc/resources/tile_draw_info.h"
 #include "cc/resources/tile_priority.h"
 #include "ui/gfx/geometry/rect.h"
 #include "ui/gfx/geometry/size.h"
 
 namespace cc {
 
 class TileManager;
 
 class CC_EXPORT Tile : public RefCountedManaged<Tile> {
  public:
-  enum TileRasterFlags { USE_PICTURE_ANALYSIS = 1 << 0 };
+  enum TileRasterFlags { USE_PICTURE_ANALYSIS = 1 << 0, IS_OPAQUE = 1 << 1 };
 
   typedef uint64 Id;
 
   Id id() const {
     return id_;
   }
 
   RasterSource* raster_source() { return raster_source_.get(); }
 
   const RasterSource* raster_source() const { return raster_source_.get(); }
@@ skipping 66 matching lines @@
   bool HasResource() const { return draw_info_.has_resource(); }
   bool NeedsRaster() const {
     return draw_info_.mode() == TileDrawInfo::PICTURE_PILE_MODE ||
            !draw_info_.IsReadyToDraw();
   }
 
   void AsValueInto(base::debug::TracedValue* dict) const;
 
   inline bool IsReadyToDraw() const { return draw_info_.IsReadyToDraw(); }
 
+  bool IsOpaque() const { return !!(flags_ & IS_OPAQUE); }
+
   const TileDrawInfo& draw_info() const { return draw_info_; }
 
   TileDrawInfo& draw_info() { return draw_info_; }
 
   float contents_scale() const { return contents_scale_; }
   gfx::Rect content_rect() const { return content_rect_; }
 
   int layer_id() const { return layer_id_; }
 
   int source_frame_number() const { return source_frame_number_; }
@@ skipping 61 matching lines @@
   unsigned scheduled_priority_;
 
   scoped_refptr<RasterTask> raster_task_;
 
   DISALLOW_COPY_AND_ASSIGN(Tile);
 };
 
 }  // namespace cc
 
 #endif  // CC_RESOURCES_TILE_H_