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

cc/resources/picture_layer_tiling.cc

Index: cc/resources/picture_layer_tiling.cc
diff --git a/cc/resources/picture_layer_tiling.cc b/cc/resources/picture_layer_tiling.cc
index 9d8ea84e6966d715afecaff0588fc97e584c2b7c..e9e3b86180a0dba8a297dc77235f6f84224fe191 100644
--- a/cc/resources/picture_layer_tiling.cc
+++ b/cc/resources/picture_layer_tiling.cc
@@ -1216,50 +1216,4 @@ operator++() {
   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