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

cc/resources/picture_layer_tiling.cc

 // 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.
 
 #include "cc/resources/picture_layer_tiling.h"
 
 #include <algorithm>
 #include <cmath>
 #include <limits>
 #include <set>
@@ skipping 150 matching lines @@
     TileMap::iterator find = tiles_.find(key);
     if (find != tiles_.end())
       continue;
     CreateTile(key.first, key.second, twin_tiling);
   }
 
   VerifyLiveTilesRect();
 }
 
 void PictureLayerTiling::UpdateTilesToCurrentRasterSource(
+    RasterSource* raster_source,
     const Region& layer_invalidation,
     const gfx::Size& new_layer_bounds) {
   DCHECK(!new_layer_bounds.IsEmpty());
 
   gfx::Size content_bounds =
       gfx::ToCeiledSize(gfx::ScaleSize(new_layer_bounds, contents_scale_));
   gfx::Size tile_size = client_->CalculateTileSize(content_bounds);
 
   if (new_layer_bounds != layer_bounds_) {
     if (tile_size.IsEmpty()) {
@@ skipping 61 matching lines @@
 
   if (tile_size != tiling_data_.max_texture_size()) {
     tiling_data_.SetMaxTextureSize(tile_size);
     // When the tile size changes, the TilingData positions no longer work
     // as valid keys to the TileMap, so just drop all tiles.
     Reset();
   } else {
     Invalidate(layer_invalidation);
   }
 
-  RasterSource* raster_source = client_->GetRasterSource();
   for (TileMap::const_iterator it = tiles_.begin(); it != tiles_.end(); ++it)
     it->second->set_raster_source(raster_source);
   VerifyLiveTilesRect();
 }
 
 void PictureLayerTiling::RemoveTilesInRegion(const Region& layer_region) {
   bool recreate_invalidated_tiles = false;
   DoInvalidate(layer_region, recreate_invalidated_tiles);
 }
 
@@ skipping 267 matching lines @@
 
   // Clip the skewport to |max_skewport|.
   skewport.Intersect(max_skewport);
 
   // Finally, ensure that visible rect is contained in the skewport.
   skewport.Union(visible_rect_in_content_space);
   return skewport;
 }
 
 void PictureLayerTiling::ComputeTilePriorityRects(
-    WhichTree tree,
     const gfx::Rect& viewport_in_layer_space,
     float ideal_contents_scale,
     double current_frame_time_in_seconds,
     const Occlusion& occlusion_in_layer_space) {
   if (!NeedsUpdateForFrameAtTimeAndViewport(current_frame_time_in_seconds,
                                             viewport_in_layer_space)) {
     // This should never be zero for the purposes of has_ever_been_updated().
     DCHECK_NE(current_frame_time_in_seconds, 0.0);
     return;
   }
@@ skipping 706 matching lines @@
   DCHECK(*this);
   do {
     ++current_eviction_tiles_index_;
   } while (current_eviction_tiles_index_ != eviction_tiles_->size() &&
            !(*eviction_tiles_)[current_eviction_tiles_index_]->HasResources());
 
   return *this;
 }
 
 }  // namespace cc