Implement DisplayList GatherPixelRefs

cc/resources/display_list_recording_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_DISPLAY_LIST_RECORDING_SOURCE_H_
 #define CC_RESOURCES_DISPLAY_LIST_RECORDING_SOURCE_H_
 
 #include "base/memory/scoped_ptr.h"
 #include "cc/resources/recording_source.h"
 
 namespace cc {
 class DisplayItemList;
 class DisplayListRasterSource;
 
 class CC_EXPORT DisplayListRecordingSource : public RecordingSource {
  public:
-  DisplayListRecordingSource();
+  explicit DisplayListRecordingSource(const gfx::Size& grid_cell_size);
   ~DisplayListRecordingSource() override;
 
   // RecordingSource overrides.
   bool UpdateAndExpandInvalidation(ContentLayerClient* painter,
                                    Region* invalidation,
                                    const gfx::Size& layer_size,
                                    const gfx::Rect& visible_layer_rect,
                                    int frame_number,
                                    RecordingMode recording_mode) override;
   void DidMoveToNewCompositor() override;
@@ skipping 14 matching lines @@
 
   gfx::Rect recorded_viewport_;
   gfx::Size size_;
   int slow_down_raster_scale_factor_for_debug_;
   bool gather_pixel_refs_;
   bool requires_clear_;
   bool is_solid_color_;
   SkColor solid_color_;
   SkColor background_color_;
   int pixel_record_distance_;
+  gfx::Size grid_cell_size_;
 
   scoped_refptr<DisplayItemList> display_list_;
 
  private:
   friend class DisplayListRasterSource;
 
   void DetermineIfSolidColor();
 
   bool is_suitable_for_gpu_rasterization_;
 
   DISALLOW_COPY_AND_ASSIGN(DisplayListRecordingSource);
 };
 
 }  // namespace cc
 
 #endif  // CC_RESOURCES_DISPLAY_LIST_RECORDING_SOURCE_H_