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 a0cc434b633e7c7cc42babe49277656bef4c3bcc..aec02da310014f3b6d32779cdeefed8b1b25ac95 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);
@@ -168,12 +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,
-      const gfx::Rect& rect,
-      const Region& missing_region) const;
   gfx::Rect GetViewportForTilePriorityInContentSpace() const;
   PictureLayerImpl* GetRecycledTwinLayer();
 
@@ -221,6 +216,7 @@ class CC_EXPORT PictureLayerImpl
   // A sanity state check to make sure UpdateTilePriorities only gets called
   // after a CalculateContentsScale/ManageTilings.
   bool should_update_tile_priorities_;
+  bool only_used_low_res_last_append_quads_;
 
   // Save a copy of the visible rect and viewport size of the last frame that
   // has a valid viewport for prioritizing tiles.