Update from chromium https://crrev.com/304586

cc/test/fake_picture_layer_tiling_client.h

Index: cc/test/fake_picture_layer_tiling_client.h
diff --git a/cc/test/fake_picture_layer_tiling_client.h b/cc/test/fake_picture_layer_tiling_client.h
index c8cc4e21c4c29d41e2f8c5d82700e7f44388c99f..acf26d087c398f95ab2f09cbee2e97f45913aee8 100644
--- a/cc/test/fake_picture_layer_tiling_client.h
+++ b/cc/test/fake_picture_layer_tiling_client.h
@@ -23,7 +23,6 @@ class FakePictureLayerTilingClient : public PictureLayerTilingClient {
   // PictureLayerTilingClient implementation.
   scoped_refptr<Tile> CreateTile(PictureLayerTiling* tiling,
                                  const gfx::Rect& rect) override;
-  RasterSource* GetRasterSource() override;
   gfx::Size CalculateTileSize(const gfx::Size& content_bounds) const override;
   TilePriority::PriorityBin GetMaxTilePriorityBin() const override;
   size_t GetMaxTilesForInterestArea() const override;
@@ -61,6 +60,7 @@ class FakePictureLayerTilingClient : public PictureLayerTilingClient {
     skewport_extrapolation_limit_in_content_pixels_ = limit;
   }
   void set_tree(WhichTree tree) { tree_ = tree; }
+  RasterSource* raster_source() { return pile_.get(); }
 
   TileManager* tile_manager() const {
     return tile_manager_.get();