Update from chromium https://crrev.com/301725/

cc/layers/picture_layer_impl.h

Index: cc/layers/picture_layer_impl.h
diff --git a/cc/layers/picture_layer_impl.h b/cc/layers/picture_layer_impl.h
index 1ac106a7c1bce10fe0bddfbc3b5c46d1ae6a1684..c5aab859da58016fcd0e9e2e19909e52ceaaea7b 100644
--- a/cc/layers/picture_layer_impl.h
+++ b/cc/layers/picture_layer_impl.h
@@ -119,10 +119,10 @@ class CC_EXPORT PictureLayerImpl
   // PictureLayerTilingClient overrides.
   scoped_refptr<Tile> CreateTile(PictureLayerTiling* tiling,
                                  const gfx::Rect& content_rect) override;
-  PicturePileImpl* GetPile() override;
+  RasterSource* GetRasterSource() override;
   gfx::Size CalculateTileSize(const gfx::Size& content_bounds) const override;
-  const Region* GetInvalidation() override;
-  const PictureLayerTiling* GetTwinTiling(
+  const Region* GetPendingInvalidation() override;
+  const PictureLayerTiling* GetPendingOrActiveTwinTiling(
       const PictureLayerTiling* tiling) const override;
   PictureLayerTiling* GetRecycledTwinTiling(
       const PictureLayerTiling* tiling) override;
@@ -144,7 +144,7 @@ class CC_EXPORT PictureLayerImpl
   void RunMicroBenchmark(MicroBenchmarkImpl* benchmark) override;
 
   // Functions used by tile manager.
-  PictureLayerImpl* GetTwinLayer() { return twin_layer_; }
+  PictureLayerImpl* GetPendingOrActiveTwinLayer() const;
   bool IsOnActiveOrPendingTree() const;
   // Virtual for testing.
   virtual bool HasValidTilePriorities() const;
@@ -168,7 +168,7 @@ class CC_EXPORT PictureLayerImpl
   float SnappedContentsScale(float new_contents_scale);
   void ResetRasterScale();
   gfx::Rect GetViewportForTilePriorityInContentSpace() const;
-  PictureLayerImpl* GetRecycledTwinLayer();
+  PictureLayerImpl* GetRecycledTwinLayer() const;
 
   void DoPostCommitInitializationIfNeeded() {
     if (needs_post_commit_initialization_)