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 96e580fc16a4cffdb186cefdf091cec3047fabe7..c3ed323736b0198ea743561bfbdcad6feb1b9fe6 100644
--- a/cc/trees/layer_tree_host_impl.h
+++ b/cc/trees/layer_tree_host_impl.h
@@ -31,6 +31,7 @@
 #include "cc/quads/render_pass.h"
 #include "cc/resources/resource_provider.h"
 #include "cc/resources/tile_manager.h"
+#include "cc/resources/tile_priority_queue.h"
 #include "cc/scheduler/draw_result.h"
 #include "skia/ext/refptr.h"
 #include "third_party/skia/include/core/SkColor.h"
@@ -232,9 +233,13 @@ 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 RasterTileQueue* GetRasterQueue(TreePriority tree_priority) OVERRIDE;
+  virtual EvictionTileQueue* GetEvictionQueue(
+      TreePriority tree_prirority) OVERRIDE;
 
   // ScrollbarAnimationControllerClient implementation.
   virtual void PostDelayedScrollbarFade(const base::Closure& start_fade,
@@ -497,6 +502,8 @@ class CC_EXPORT LayerTreeHostImpl
   void ReleaseTreeResources();
   void EnforceZeroBudget(bool zero_budget);
 
+  void GetPairedPictureLayers(std::vector<PairedPictureLayer>* layers) const;
+
   bool UsePendingTreeForSync() const;
   bool UseZeroCopyTextureUpload() const;
   bool UseOneCopyTextureUpload() const;
@@ -690,6 +697,9 @@ class CC_EXPORT LayerTreeHostImpl
 
   std::vector<PictureLayerImpl*> picture_layers_;
 
+  RasterTileQueue raster_queue_;
+  EvictionTileQueue eviction_queue_;
+
   DISALLOW_COPY_AND_ASSIGN(LayerTreeHostImpl);
 };