GTTF: Add missing virtual destructors.

cc/picture_layer_tiling.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_PICTURE_LAYER_TILING_H_
 #define CC_PICTURE_LAYER_TILING_H_
 
 #include "base/basictypes.h"
 #include "base/hash_tables.h"
 #include "base/memory/scoped_ptr.h"
 #include "cc/cc_export.h"
 #include "cc/hash_pair.h"
 #include "cc/region.h"
 #include "cc/tile.h"
 #include "cc/tile_priority.h"
 #include "cc/tiling_data.h"
 #include "ui/gfx/rect.h"
 
 namespace cc {
 
 class PictureLayerTiling;
 
 class PictureLayerTilingClient {
-  public:
-   // Create a tile at the given content_rect (in the contents scale of the
-   // tiling) This might return null if the client cannot create such a tile.
-   virtual scoped_refptr<Tile> CreateTile(
-     PictureLayerTiling* tiling,
-     gfx::Rect content_rect) = 0;
-   virtual void UpdatePile(Tile* tile) = 0;
+ public:
+  // Create a tile at the given content_rect (in the contents scale of the
+  // tiling) This might return null if the client cannot create such a tile.
+  virtual scoped_refptr<Tile> CreateTile(
+      PictureLayerTiling* tiling,
+      gfx::Rect content_rect) = 0;
+  virtual void UpdatePile(Tile* tile) = 0;
+
+ protected:
+  virtual ~PictureLayerTilingClient() { }
 };
 
 class CC_EXPORT PictureLayerTiling {
  public:
   ~PictureLayerTiling();
 
   // Create a tiling with no tiles.  CreateTiles must be called to add some.
   static scoped_ptr<PictureLayerTiling> Create(float contents_scale,
                                                gfx::Size tile_size);
   scoped_ptr<PictureLayerTiling> Clone() const;
@@ skipping 90 matching lines @@
   TileMap tiles_;
   TilingData tiling_data_;
   TileResolution resolution_;
 
   friend class Iterator;
 };
 
 }  // namespace cc
 
 #endif  // CC_PICTURE_LAYER_TILING_H_