cc: Start using raster/eviction iterators.

cc/trees/layer_tree_host_impl.h

Index: cc/trees/layer_tree_host_impl.h
diff --git a/cc/trees/layer_tree_host_impl.h b/cc/trees/layer_tree_host_impl.h
index f5142f925e413404df06c65b195e438a4373a812..57728cd805089f232b8538ca9a341ee06c8443a7 100644
--- a/cc/trees/layer_tree_host_impl.h
+++ b/cc/trees/layer_tree_host_impl.h
@@ -41,6 +41,7 @@ namespace cc {
 class CompletionEvent;
 class CompositorFrameMetadata;
 class DebugRectHistory;
+class EvictionTilePriorityQueue;
 class FrameRateCounter;
 class LayerImpl;
 class LayerTreeHostImplTimeSourceAdapter;
@@ -49,6 +50,7 @@ class MemoryHistory;
 class PageScaleAnimation;
 class PaintTimeCounter;
 class PictureLayerImpl;
+class RasterTilePriorityQueue;
 class RasterWorkerPool;
 class RenderPassDrawQuad;
 class RenderingStatsInstrumentation;
@@ -233,9 +235,14 @@ class CC_EXPORT LayerTreeHostImpl
   virtual void RunOnDemandRasterTask(Task* on_demand_raster_task) OVERRIDE;
 
   // TileManagerClient implementation.
-  virtual const std::vector<PictureLayerImpl*>& GetPictureLayers() OVERRIDE;
+  virtual const std::vector<PictureLayerImpl*>& GetPictureLayers()
+      const OVERRIDE;
   virtual void NotifyReadyToActivate() OVERRIDE;
   virtual void NotifyTileStateChanged(const Tile* tile) OVERRIDE;
+  virtual void BuildRasterQueue(RasterTilePriorityQueue* queue,
+                                TreePriority tree_priority) OVERRIDE;
+  virtual void BuildEvictionQueue(EvictionTilePriorityQueue* queue,
+                                  TreePriority tree_prirority) OVERRIDE;
 
   // ScrollbarAnimationControllerClient implementation.
   virtual void PostDelayedScrollbarFade(const base::Closure& start_fade,
@@ -465,6 +472,8 @@ class CC_EXPORT LayerTreeHostImpl
   void RegisterPictureLayerImpl(PictureLayerImpl* layer);
   void UnregisterPictureLayerImpl(PictureLayerImpl* layer);
 
+  void GetPairedPictureLayers(std::vector<PairedPictureLayer>* layers) const;
+
  protected:
   LayerTreeHostImpl(
       const LayerTreeSettings& settings,