cc: Give non-drawing layers that are rasterized a lower priority.

cc/tiles/tiling_set_raster_queue_all.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_RASTER_QUEUE_ALL_H_
 #define CC_TILES_TILING_SET_RASTER_QUEUE_ALL_H_
 
 #include <stddef.h>
 
 #include "base/containers/stack_container.h"
 #include "base/macros.h"
 #include "cc/cc_export.h"
 #include "cc/tiles/picture_layer_tiling_set.h"
 #include "cc/tiles/prioritized_tile.h"
 #include "cc/tiles/tile.h"
 #include "cc/tiles/tile_priority.h"
 
 namespace cc {
 
 // This queue returns all tiles required to be rasterized from HIGH_RESOLUTION
 // and LOW_RESOLUTION tilings.
 class CC_EXPORT TilingSetRasterQueueAll {
  public:
   TilingSetRasterQueueAll(PictureLayerTilingSet* tiling_set,
-                          bool prioritize_low_res);
+                          bool prioritize_low_res,
+                          bool is_drawing_layer);
   ~TilingSetRasterQueueAll();
 
   const PrioritizedTile& Top() const;
   void Pop();
   bool IsEmpty() const;
+  bool is_drawing_layer() const { return is_drawing_layer_; }
 
  private:
   // Helper base class for individual region iterators.
   class OnePriorityRectIterator {
    public:
     OnePriorityRectIterator();
     OnePriorityRectIterator(
         PictureLayerTiling* tiling,
         TilingData* tiling_data,
         PictureLayerTiling::PriorityRectType priority_rect_type);
@@ skipping 142 matching lines @@
     IteratorType iterator_type;
     TilePriority::PriorityBin tile_type;
   };
 
   size_t current_stage_;
 
   // The max number of stages is 6: 1 low res, 3 high res, and 2 active non
   // ideal pending high res.
   base::StackVector<IterationStage, 6> stages_;
   TilingIterator iterators_[NUM_ITERATORS];
+  bool is_drawing_layer_ = false;
 
   DISALLOW_COPY_AND_ASSIGN(TilingSetRasterQueueAll);
 };
 
 }  // namespace cc
 
 #endif  // CC_TILES_TILING_SET_RASTER_QUEUE_ALL_H_