cc: Rasterize cheap tiles immediately

cc/picture_pile_impl.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_PILE_IMPL_H_
 #define CC_PICTURE_PILE_IMPL_H_
 
 #include <list>
 #include <map>
 
@@ skipping 31 matching lines @@
       std::list<skia::LazyPixelRef*>& pixel_refs);
 
   void PushPropertiesTo(PicturePileImpl* other);
 
   skia::RefPtr<SkPicture> GetFlattenedPicture();
 
   void set_slow_down_raster_scale_factor(int factor) {
     slow_down_raster_scale_factor_for_debug_ = factor;
   }
 
+  bool IsCheapInRect(gfx::Rect content_rect, float contents_scale) const;
+
  protected:
   friend class PicturePile;
 
   PicturePileImpl();
   virtual ~PicturePileImpl();
 
   typedef std::map<base::PlatformThreadId, scoped_refptr<PicturePileImpl> >
       CloneMap;
   CloneMap clones_;
 
   int slow_down_raster_scale_factor_for_debug_;
 
   DISALLOW_COPY_AND_ASSIGN(PicturePileImpl);
 };
 
 }  // namespace cc
 
 #endif  // CC_PICTURE_PILE_IMPL_H_