Update from https://crrev.com/316786

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 <bitset>
 #include <utility>
 #include <vector>
@@ skipping 16 matching lines @@
                                    Region* invalidation,
                                    bool can_use_lcd_text,
                                    const gfx::Size& layer_size,
                                    const gfx::Rect& visible_layer_rect,
                                    int frame_number,
                                    RecordingMode recording_mode) override;
   scoped_refptr<RasterSource> CreateRasterSource() const override;
   gfx::Size GetSize() const final;
   void SetEmptyBounds() override;
   void SetSlowdownRasterScaleFactor(int factor) override;
+  void SetBackgroundColor(SkColor background_color) override;
+  void SetRequiresClear(bool requires_clear) override;
   bool IsSuitableForGpuRasterization() const override;
   void SetUnsuitableForGpuRasterizationForTesting() override;
   gfx::Size GetTileGridSizeForTesting() const override;
 
  protected:
   class CC_EXPORT PictureInfo {
    public:
     enum { INVALIDATION_FRAMES_TRACKED = 32 };
 
     PictureInfo();
@@ skipping 43 matching lines @@
   // be recordings outside this rect, but everything inside the rect is
   // recorded.
   gfx::Rect recorded_viewport_;
   float min_contents_scale_;
   gfx::Size tile_grid_size_;
   int slow_down_raster_scale_factor_for_debug_;
   bool can_use_lcd_text_;
   // A hint about whether there are any recordings. This may be a false
   // positive.
   bool has_any_recordings_;
+  bool clear_canvas_with_debug_color_;
+  bool requires_clear_;
   bool is_solid_color_;
   SkColor solid_color_;
+  SkColor background_color_;
   int pixel_record_distance_;
 
  private:
   friend class PicturePileImpl;
 
   void CreatePictures(ContentLayerClient* painter,
                       RecordingMode recording_mode,
                       const std::vector<gfx::Rect>& record_rects);
   void GetInvalidTileRects(const gfx::Rect& interest_rect,
                            Region* invalidation,
                            const gfx::Rect& visible_layer_rect,
                            int frame_number,
                            std::vector<gfx::Rect>* invalid_tiles);
   bool ApplyInvalidationAndResize(const gfx::Rect& interest_rect,
                                   Region* invalidation,
                                   const gfx::Size& layer_size,
                                   int frame_number,
                                   bool can_use_lcd_text_changed);
   void DetermineIfSolidColor();
   void SetBufferPixels(int buffer_pixels);
 
   bool is_suitable_for_gpu_rasterization_;
 
   DISALLOW_COPY_AND_ASSIGN(PicturePile);
 };
 
 }  // namespace cc
 
 #endif  // CC_RESOURCES_PICTURE_PILE_H_