cc: Move tiling management out of draw properties calculation.

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>
 
@@ skipping 464 matching lines @@
   // Assign now priority to all visible tiles.
   bool include_borders = true;
   for (TilingData::Iterator iter(
            &tiling_data_, visible_rect_in_content_space, include_borders);
        iter;
        ++iter) {
     TileMap::iterator find = tiles_.find(iter.index());
     if (find == tiles_.end())
       continue;
     Tile* tile = find->second.get();
-
     tile->SetPriority(tree, now_priority);
   }
 
   // Assign soon priority to skewport tiles.
   for (TilingData::DifferenceIterator iter(
            &tiling_data_, skewport, visible_rect_in_content_space);
        iter;
        ++iter) {
     TileMap::iterator find = tiles_.find(iter.index());
     if (find == tiles_.end())
@@ skipping 27 matching lines @@
     float distance_to_visible =
         visible_rect_in_content_space.ManhattanInternalDistance(tile_bounds) *
         content_to_screen_scale;
     TilePriority priority(
         resolution_, TilePriority::EVENTUALLY, distance_to_visible);
     tile->SetPriority(tree, priority);
   }
 
   // Upgrade the priority on border tiles to be SOON.
   current_soon_border_rect_ = visible_rect_in_content_space;
+  float max_tiling_scale = 1.f;
+  for (size_t i = 0; i < this->num_tilings(); ++i) {
+    const PictureLayerTiling* tiling = this->tiling_at(i);
+    max_tiling_scale = std::max(max_tiling_scale, tiling->contents_scale());
+  }
   float border = kSoonBorderDistanceInScreenPixels / content_to_screen_scale;
   current_soon_border_rect_.Inset(-border, -border, -border, -border);
   for (TilingData::DifferenceIterator iter(
            &tiling_data_, current_soon_border_rect_, skewport);
        iter;
        ++iter) {
     TileMap::iterator find = tiles_.find(iter.index());
     if (find == tiles_.end())
       continue;
     Tile* tile = find->second.get();
@@ skipping 416 matching lines @@
   tiling_->UpdateEvictionCacheIfNeeded(tree_priority_);
   tile_iterator_ = tiling_->eviction_tiles_cache_.begin();
   is_valid_ = true;
   if (tile_iterator_ != tiling_->eviction_tiles_cache_.end() &&
       !(*tile_iterator_)->HasResources()) {
     ++(*this);
   }
 }
 
 }  // namespace cc