cc: Partial tile update for one-copy raster.

cc/resources/raster_source.h

 // Copyright 2014 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_RASTER_SOURCE_H_
 #define CC_RESOURCES_RASTER_SOURCE_H_
 
 #include <vector>
 
 #include "base/memory/ref_counted.h"
@@ skipping 24 matching lines @@
   };
 
   // Raster a subrect of this RasterSource into the given canvas. It is
   // assumed that contents_scale has already been applied to this canvas.
   // Writes the total number of pixels rasterized and the time spent
   // rasterizing to the stats if the respective pointer is not nullptr.
   // It is assumed that the canvas passed here will only be rasterized by
   // this raster source via this call.
   virtual void PlaybackToCanvas(SkCanvas* canvas,
                                 const gfx::Rect& canvas_rect,
-                                float contents_scale) const = 0;
+                                float contents_scale,
+                                bool partial_update) const = 0;
 
   // Similar to above, except that the canvas passed here can (or was already)
   // rasterized into by another raster source. That is, it is not safe to clear
   // the canvas or discard its underlying memory.
   virtual void PlaybackToSharedCanvas(SkCanvas* canvas,
                                       const gfx::Rect& canvas_rect,
                                       float contents_scale) const = 0;
 
   // Analyze to determine if the given rect at given scale is of solid color in
   // this raster source.
@@ skipping 51 matching lines @@
   RasterSource() {}
   virtual ~RasterSource() {}
 
  private:
   DISALLOW_COPY_AND_ASSIGN(RasterSource);
 };
 
 }  // namespace cc
 
 #endif  // CC_RESOURCES_RASTER_SOURCE_H_