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

cc/resources/picture_layer_tiling_set.h

Index: cc/resources/picture_layer_tiling_set.h
diff --git a/cc/resources/picture_layer_tiling_set.h b/cc/resources/picture_layer_tiling_set.h
index ddde1d7be42590903e4f2e5d2e1a0b0c019e2c62..489bc0c37b07c50370d209da100baa8680f11fa4 100644
--- a/cc/resources/picture_layer_tiling_set.h
+++ b/cc/resources/picture_layer_tiling_set.h
@@ -34,7 +34,9 @@ class CC_EXPORT PictureLayerTilingSet {
     size_t end;
   };
 
-  explicit PictureLayerTilingSet(PictureLayerTilingClient* client);
+  static scoped_ptr<PictureLayerTilingSet> Create(
+      PictureLayerTilingClient* client);
+
   ~PictureLayerTilingSet();
 
   void SetClient(PictureLayerTilingClient* client);
@@ -50,7 +52,8 @@ class CC_EXPORT PictureLayerTilingSet {
   bool SyncTilings(const PictureLayerTilingSet& other,
                    const gfx::Size& new_layer_bounds,
                    const Region& layer_invalidation,
-                   float minimum_contents_scale);
+                   float minimum_contents_scale,
+                   RasterSource* raster_source);
 
   PictureLayerTiling* AddTiling(float contents_scale,
                                 const gfx::Size& layer_bounds);
@@ -72,6 +75,13 @@ class CC_EXPORT PictureLayerTilingSet {
   // Remove all tiles; keep all tilings.
   void RemoveAllTiles();
 
+  // Update the rects and priorities for tiles based on the given information.
+  bool UpdateTilePriorities(const gfx::Rect& required_rect_in_layer_space,
+                            float ideal_contents_scale,
+                            double current_frame_time_in_seconds,
+                            const Occlusion& occlusion_in_layer_space,
+                            bool can_require_tiles_for_activation);
+
   // For a given rect, iterates through tiles that can fill it.  If no
   // set of tiles with resources can fill the rect, then it will iterate
   // through null tiles with valid geometry_rect() until the rect is full.
@@ -123,6 +133,8 @@ class CC_EXPORT PictureLayerTilingSet {
   TilingRange GetTilingRange(TilingRangeType type) const;
 
  private:
+  explicit PictureLayerTilingSet(PictureLayerTilingClient* client);
+
   PictureLayerTilingClient* client_;
   ScopedPtrVector<PictureLayerTiling> tilings_;