a412f24e41
And in general run analysis server tests with `previewDart2 = true`. R=brianwilkerson@google.com, devoncarew@google.com Change-Id: I063d667e96a46d60d3b10aa1a87b4c7a7d2252e5 Reviewed-on: https://dart-review.googlesource.com/42101 Reviewed-by: Brian Wilkerson <brianwilkerson@google.com>