cc: Move LayerEvictionTileIterator to a separate file and make it a queue

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 1198 matching lines @@
         break;
     }
     current_tile_ = tiling_->TileAt(next_index.first, next_index.second);
   }
 
   if (current_tile_)
     tiling_->UpdateTileAndTwinPriority(current_tile_);
   return *this;
 }
 
-PictureLayerTiling::TilingEvictionTileIterator::TilingEvictionTileIterator()
-    : eviction_tiles_(NULL), current_eviction_tiles_index_(0u) {
-}
-
-PictureLayerTiling::TilingEvictionTileIterator::TilingEvictionTileIterator(
-    PictureLayerTiling* tiling,
-    TreePriority tree_priority,
-    EvictionCategory category)
-    : eviction_tiles_(tiling->GetEvictionTiles(tree_priority, category)),
-      // Note: initializing to "0 - 1" works as overflow is well defined for
-      // unsigned integers.
-      current_eviction_tiles_index_(static_cast<size_t>(0) - 1) {
-  DCHECK(eviction_tiles_);
-  ++(*this);
-}
-
-PictureLayerTiling::TilingEvictionTileIterator::~TilingEvictionTileIterator() {
-}
-
-PictureLayerTiling::TilingEvictionTileIterator::operator bool() const {
-  return eviction_tiles_ &&
-         current_eviction_tiles_index_ != eviction_tiles_->size();
-}
-
-Tile* PictureLayerTiling::TilingEvictionTileIterator::operator*() {
-  DCHECK(*this);
-  return (*eviction_tiles_)[current_eviction_tiles_index_];
-}
-
-const Tile* PictureLayerTiling::TilingEvictionTileIterator::operator*() const {
-  DCHECK(*this);
-  return (*eviction_tiles_)[current_eviction_tiles_index_];
-}
-
-PictureLayerTiling::TilingEvictionTileIterator&
-PictureLayerTiling::TilingEvictionTileIterator::
-operator++() {
-  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