2e984a382d
This will allow more gradual migration of js_ast. Change-Id: I3e948ad5c79fa9880b7eb3bccd7c15cbf9786e32 Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/238660 Reviewed-by: Nicholas Shahan <nshahan@google.com> Commit-Queue: Stephen Adams <sra@google.com>