cc: Inflate invalidation in each picture list

cc/resources/picture_pile.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_PICTURE_PILE_H_
 #define CC_RESOURCES_PICTURE_PILE_H_
 
 #include "cc/resources/picture_pile_base.h"
 #include "ui/gfx/rect.h"
 
@@ skipping 20 matching lines @@
   }
 
   void set_slow_down_raster_scale_factor(int factor) {
     slow_down_raster_scale_factor_for_debug_ = factor;
   }
 
   void set_show_debug_picture_borders(bool show) {
     show_debug_picture_borders_ = show;
   }
 
+ protected:
+  virtual ~PicturePile();
+
  private:
-  virtual ~PicturePile();
   friend class PicturePileImpl;
 
   // Add an invalidation to this picture list.  If the list needs to be
   // entirely recreated, leave it empty.  Do not call this on an empty list.
   void InvalidateRect(
       PictureList& picture_list,
       gfx::Rect invalidation);
 
   DISALLOW_COPY_AND_ASSIGN(PicturePile);
 };
 
 }  // namespace cc
 
 #endif  // CC_RESOURCES_PICTURE_PILE_H_