Revert "Revert 253606 "Revert 251238 "cc: Clean up iterator template to ...""

cc/trees/layer_tree_host_impl.cc

Index: cc/trees/layer_tree_host_impl.cc
diff --git a/cc/trees/layer_tree_host_impl.cc b/cc/trees/layer_tree_host_impl.cc
index e8155dd92037857b1194fa6918776d2c8fae88e8..d090ddc3d3da2ba116c9acfa0abfd5edffbec692 100644
--- a/cc/trees/layer_tree_host_impl.cc
+++ b/cc/trees/layer_tree_host_impl.cc
@@ -762,9 +762,12 @@ DrawSwapReadbackResult::DrawResult LayerTreeHostImpl::CalculateRenderPasses(
         &frame->non_occluding_screen_space_rects);
   }
 
-  // Add quads to the Render passes in front-to-back order to allow for testing
+  // Add quads to the Render passes in FrontToBack order to allow for testing
   // occlusion and performing culling during the tree walk.
-  typedef LayerIterator<LayerImpl> LayerIteratorType;
+  typedef LayerIterator<LayerImpl,
+                        LayerImplList,
+                        RenderSurfaceImpl,
+                        LayerIteratorActions::FrontToBack> LayerIteratorType;
 
   // Typically when we are missing a texture and use a checkerboard quad, we
   // still draw the frame. However when the layer being checkerboarded is moving