cc: Start using raster/eviction iterators.

cc/layers/picture_layer_impl.h

Index: cc/layers/picture_layer_impl.h
diff --git a/cc/layers/picture_layer_impl.h b/cc/layers/picture_layer_impl.h
index c7d987fee0fe05deb7e1fe09c8c0fc056e466837..0d672a6da9b54e2806596d53075cdb56fe664718 100644
--- a/cc/layers/picture_layer_impl.h
+++ b/cc/layers/picture_layer_impl.h
@@ -133,6 +133,7 @@ class CC_EXPORT PictureLayerImpl
   virtual float GetSkewportTargetTimeInSeconds() const OVERRIDE;
   virtual int GetSkewportExtrapolationLimitInContentPixels() const OVERRIDE;
   virtual WhichTree GetTree() const OVERRIDE;
+  virtual bool RequiresHighResToDraw() const OVERRIDE;
 
   // PushPropertiesTo active tree => pending tree.
   void SyncTiling(const PictureLayerTiling* tiling);
@@ -168,13 +169,6 @@ class CC_EXPORT PictureLayerImpl
   float MinimumContentsScale() const;
   float SnappedContentsScale(float new_contents_scale);
   void ResetRasterScale();
-  void MarkVisibleResourcesAsRequired() const;
-  bool MarkVisibleTilesAsRequired(
-      PictureLayerTiling* tiling,
-      const PictureLayerTiling* optional_twin_tiling,
-      float contents_scale,
-      const gfx::Rect& rect,
-      const Region& missing_region) const;
   gfx::Rect GetViewportForTilePriorityInContentSpace() const;
   PictureLayerImpl* GetRecycledTwinLayer();