cc: Refactor additional code from BuildRasterQueue.

cc/trees/layer_tree_host_impl.h

 // Copyright 2011 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_TREES_LAYER_TREE_HOST_IMPL_H_
 #define CC_TREES_LAYER_TREE_HOST_IMPL_H_
 
 #include <set>
 #include <string>
 #include <vector>
@@ skipping 231 matching lines @@
 
   // TileManagerClient implementation.
   void NotifyReadyToActivate() override;
   void NotifyReadyToDraw() override;
   void NotifyTileStateChanged(const Tile* tile) override;
   scoped_ptr<RasterTilePriorityQueue> BuildRasterQueue(
       TreePriority tree_priority,
       RasterTilePriorityQueue::Type type) override;
   scoped_ptr<EvictionTilePriorityQueue> BuildEvictionQueue(
       TreePriority tree_priority) override;
+  void SetIsLikelyToRequireADraw(bool is_likely_to_require_a_draw) override;
 
   // Returns existing picture layers.
   // TODO(vmpstr): Remove this, it's only used in tests.
   const std::vector<PictureLayerImpl*>& GetPictureLayers() const;
 
   // ScrollbarAnimationControllerClient implementation.
   void PostDelayedScrollbarFade(const base::Closure& start_fade,
                                 base::TimeDelta delay) override;
   void SetNeedsScrollbarAnimationFrame() override;
 
@@ skipping 459 matching lines @@
   SharedBitmapManager* shared_bitmap_manager_;
   gpu::GpuMemoryBufferManager* gpu_memory_buffer_manager_;
   int id_;
 
   std::set<SwapPromiseMonitor*> swap_promise_monitor_;
 
   std::vector<PictureLayerImpl*> picture_layers_;
   std::vector<PictureLayerImpl::Pair> picture_layer_pairs_;
 
   bool requires_high_res_to_draw_;
-  bool required_for_draw_tile_is_top_of_raster_queue_;
+  bool is_likely_to_require_a_draw_;
 
   DISALLOW_COPY_AND_ASSIGN(LayerTreeHostImpl);
 };
 
 }  // namespace cc
 
 #endif  // CC_TREES_LAYER_TREE_HOST_IMPL_H_