cc: Move TryScroll from LayerImpl to LayerTreeHostImpl

cc/trees/property_tree_builder.cc

Index: cc/trees/property_tree_builder.cc
diff --git a/cc/trees/property_tree_builder.cc b/cc/trees/property_tree_builder.cc
index c95810d8b8c95432d8432c54c86ade9ceac56b85..d4209a605091484e1b8092575200263f391166e1 100644
--- a/cc/trees/property_tree_builder.cc
+++ b/cc/trees/property_tree_builder.cc
@@ -698,6 +698,8 @@ void AddScrollNodeIfNeeded(
         layer == data_from_ancestor.outer_viewport_scroll_layer;
 
     node.data.bounds = layer->bounds();
+    node.data.transform_id =
+        data_for_children->transform_tree_parent->transform_tree_index();
 
     data_for_children->scroll_tree_parent =
         data_for_children->scroll_tree->Insert(node, parent_id);