Update from https://crrev.com/311145

cc/resources/tiling_set_raster_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_RASTER_QUEUE_H_
 #define CC_RESOURCES_TILING_SET_RASTER_QUEUE_H_
 
-#include "cc/base/cc_export.h"
-#include "cc/resources/picture_layer_tiling_set.h"
-#include "cc/resources/tile.h"
-#include "cc/resources/tile_priority.h"
+namespace cc {
+class Tile;
 
-namespace cc {
+class TilingSetRasterQueue {
+ public:
+  virtual ~TilingSetRasterQueue() {}
 
-class CC_EXPORT TilingSetRasterQueue {
- public:
-  TilingSetRasterQueue();
-  TilingSetRasterQueue(PictureLayerTilingSet* tiling_set,
-                       bool prioritize_low_res);
-  ~TilingSetRasterQueue();
-
-  Tile* Top();
-  const Tile* Top() const;
-  void Pop();
-  bool IsEmpty() const;
-
- private:
-  class TilingIterator {
-   public:
-    TilingIterator();
-    explicit TilingIterator(PictureLayerTiling* tiling,
-                            TilingData* tiling_data);
-    ~TilingIterator();
-
-    operator bool() const { return !!current_tile_; }
-    const Tile* operator*() const { return current_tile_; }
-    Tile* operator*() { return current_tile_; }
-    TilePriority::PriorityBin type() const {
-      switch (phase_) {
-        case VISIBLE_RECT:
-          return TilePriority::NOW;
-        case SKEWPORT_RECT:
-        case SOON_BORDER_RECT:
-          return TilePriority::SOON;
-        case EVENTUALLY_RECT:
-          return TilePriority::EVENTUALLY;
-      }
-      NOTREACHED();
-      return TilePriority::EVENTUALLY;
-    }
-
-    TilingIterator& operator++();
-
-   private:
-    enum Phase {
-      VISIBLE_RECT,
-      SKEWPORT_RECT,
-      SOON_BORDER_RECT,
-      EVENTUALLY_RECT
-    };
-
-    void AdvancePhase();
-    bool TileNeedsRaster(Tile* tile) const {
-      return tile->NeedsRaster() && !tiling_->IsTileOccluded(tile);
-    }
-
-    PictureLayerTiling* tiling_;
-    TilingData* tiling_data_;
-
-    Phase phase_;
-
-    Tile* current_tile_;
-    TilingData::Iterator visible_iterator_;
-    TilingData::SpiralDifferenceIterator spiral_iterator_;
-  };
-
-  enum IteratorType { LOW_RES, HIGH_RES, NUM_ITERATORS };
-
-  void AdvanceToNextStage();
-
-  PictureLayerTilingSet* tiling_set_;
-
-  struct IterationStage {
-    IteratorType iterator_type;
-    TilePriority::PriorityBin tile_type;
-  };
-
-  size_t current_stage_;
-
-  // One low res stage, and three high res stages.
-  IterationStage stages_[4];
-  TilingIterator iterators_[NUM_ITERATORS];
+  virtual Tile* Top() = 0;
+  virtual const Tile* Top() const = 0;
+  virtual void Pop() = 0;
+  virtual bool IsEmpty() const = 0;
 };
 
 }  // namespace cc
 
 #endif  // CC_RESOURCES_TILING_SET_RASTER_QUEUE_H_