cc: Keep tile eviction prioritization consistent with raster priorities.

cc/tiles/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_TILES_TILING_SET_EVICTION_QUEUE_H_
 #define CC_TILES_TILING_SET_EVICTION_QUEUE_H_
 
 #include <stddef.h>
 
 #include <vector>
@@ skipping 49 matching lines @@
 //
 // Additional notes:
 // Since eventually the tiles are considered to have the priority which is the
 // higher of the two trees, we might visit a tile that should actually be
 // returned by its twin. In those situations, the tiles are not returned. That
 // is, since the twin has higher priority, it should return it when it gets to
 // it. This ensures that we don't block raster because we've returned a tile
 // with low priority on one tree, but high combined priority.
 class CC_EXPORT TilingSetEvictionQueue {
  public:
-  explicit TilingSetEvictionQueue(PictureLayerTilingSet* tiling_set);
+  explicit TilingSetEvictionQueue(PictureLayerTilingSet* tiling_set,
+                                  bool is_drawing_layer);
   ~TilingSetEvictionQueue();
 
   const PrioritizedTile& Top() const;
   void Pop();
   bool IsEmpty() const;
+  bool is_drawing_layer() const { return is_drawing_layer_; }
 
  private:
   enum Phase {
     EVENTUALLY_RECT,
     SOON_BORDER_RECT,
     SKEWPORT_RECT,
     PENDING_VISIBLE_RECT,
     PENDING_VISIBLE_RECT_REQUIRED_FOR_ACTIVATION,
     VISIBLE_RECT_OCCLUDED,
     VISIBLE_RECT_UNOCCLUDED,
@@ skipping 105 matching lines @@
   WhichTree tree_;
   Phase phase_;
   PrioritizedTile current_tile_;
   std::vector<PictureLayerTiling*> tilings_;
 
   EventuallyTilingIterator eventually_iterator_;
   SoonBorderTilingIterator soon_iterator_;
   SkewportTilingIterator skewport_iterator_;
   PendingVisibleTilingIterator pending_visible_iterator_;
   VisibleTilingIterator visible_iterator_;
+  bool is_drawing_layer_;
 };
 
 }  // namespace cc
 
 #endif  // CC_TILES_TILING_SET_EVICTION_QUEUE_H_