Remove parts of //cc we aren't using

cc/resources/tiling_set_eviction_queue.h

-// Copyright 2014 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.
-
-#ifndef CC_RESOURCES_TILING_SET_EVICTION_QUEUE_H_
-#define CC_RESOURCES_TILING_SET_EVICTION_QUEUE_H_
-
-#include <vector>
-
-#include "cc/base/cc_export.h"
-#include "cc/resources/picture_layer_tiling_set.h"
-
-namespace cc {
-
-// This eviction queue returned tiles from all tilings in a tiling set in
-// the following order:
-// 1) Eventually rect tiles (EVENTUALLY tiles).
-//    1) Eventually rect tiles not required for activation from each tiling in
-//       the tiling set, in turn, in the following order:
-//       1) the first higher than high res tiling, the second one and so on
-//       2) the first lower than low res tiling, the second one and so on
-//       3) the first between high and low res tiling, the second one and so on
-//       4) low res tiling
-//       5) high res tiling
-//    2) Eventually rect tiles required for activation from the tiling with
-//       required for activation tiles. In the case of a pending tree tiling
-//       set that is the high res tiling. In the case of an active tree tiling
-//       set that is a tiling whose twin tiling is a pending tree high res
-//       tiling.
-// 2) Soon border rect and skewport rect tiles (whose priority bin is SOON
-//    unless the max tile priority bin is lowered by PictureLayerTilingClient).
-//    1) Soon border rect and skewport rect tiles not required for activation
-//       from each tiling in the tiling set.
-//        * Tilings are iterated in the same order as in the case of eventually
-//          rect tiles not required for activation.
-//        * For each tiling, first soon border rect tiles and then skewport
-//          rect tiles are returned.
-//    2) Soon border rect and skewport rect tiles required for activation from
-//       the tiling with required for activation tiles.
-//        * First soon border rect tiles and then skewport rect tiles are
-//          returned.
-// 3) Visible rect tiles (whose priority bin is NOW unless the max tile
-//    priority bin is lowered by PictureLayerTilingClient).
-//    1) Visible rect tiles not required for activation from each tiling in
-//       the tiling set.
-//        * Tilings are iterated in the same order as in the case of eventually
-//          rect tiles not required for activation.
-//        * For each tiling, first occluded tiles and then unoccluded tiles
-//          are returned.
-//    2) Visible rect tiles required for activation from the tiling with
-//       required for activation tiles.
-//        * First occluded tiles and then unoccluded tiles are returned.
-//    If the max tile priority bin is lowered by PictureLayerTilingClient,
-//    occlusion is not taken into account as occlusion is meaningful only for
-//    NOW tiles.
-//
-// Within each tiling and tile priority rect, tiles are returned in reverse
-// spiral order i.e. in (mostly) decreasing distance-to-visible order.
-//
-// If the skip_shared_out_of_order_tiles value passed to the constructor is
-// true (like it should be when there is a twin layer with a twin tiling set),
-// eviction queue does not return shared which are out of order because their
-// priority for tree priority is lowered or raised by a twin layer.
-//  * If tree_priority is SAME_PRIORITY_FOR_BOTH_TREES, this happens for
-//    a tile specific lower priority tree eviction queue (because priority for
-//    tree priority is a merged priority).
-//  * If tree priority is NEW_CONTENT_TAKES_PRIORITY, this happens for
-//    an active tree eviction queue (because priority for tree priority is
-//    the pending priority).
-//  * If tree_priority is SMOOTHNESS_TAKES_PRIORITY, this happens for a pending
-//    tree eviction queue (because priority for tree priority is the active
-//    priority).
-// Those skipped shared out of order tiles are when returned only by the twin
-// eviction queue.
-class CC_EXPORT TilingSetEvictionQueue {
- public:
-  TilingSetEvictionQueue(PictureLayerTilingSet* tiling_set,
-                         TreePriority tree_priority,
-                         bool skip_shared_out_of_order_tiles);
-  ~TilingSetEvictionQueue();
-
-  Tile* Top();
-  const Tile* Top() const;
-  void Pop();
-  bool IsEmpty() const;
-
- private:
-  bool AdvanceToNextEvictionTile();
-  bool AdvanceToNextPriorityBin();
-  bool AdvanceToNextTilingRangeType();
-  bool AdvanceToNextValidTiling();
-
-  PictureLayerTilingSet::TilingRange CurrentTilingRange() const;
-  size_t CurrentTilingIndex() const;
-  bool IsSharedOutOfOrderTile(const Tile* tile) const;
-  size_t TilingIndexWithRequiredForActivationTiles() const;
-
-  PictureLayerTilingSet* tiling_set_;
-  WhichTree tree_;
-  TreePriority tree_priority_;
-  bool skip_all_shared_tiles_;
-  bool skip_shared_out_of_order_tiles_;
-  bool processing_soon_border_rect_;
-  bool processing_tiling_with_required_for_activation_tiles_;
-  size_t tiling_index_with_required_for_activation_tiles_;
-
-  TilePriority::PriorityBin current_priority_bin_;
-  PictureLayerTiling* current_tiling_;
-  size_t current_tiling_index_;
-  PictureLayerTilingSet::TilingRangeType current_tiling_range_type_;
-  Tile* current_eviction_tile_;
-
-  TilingData::ReverseSpiralDifferenceIterator spiral_iterator_;
-  TilingData::Iterator visible_iterator_;
-  std::vector<Tile*> unoccluded_now_tiles_;
-};
-
-}  // namespace cc
-
-#endif  // CC_RESOURCES_TILING_SET_EVICTION_QUEUE_H_