Whenever we install a getter or setter, we need to install a corresponding
one that calls `super`, because JS treats getters/setters as pairs for the
purposes of lookup. Normally we generate the paired super accessor, but for
mixins we cannot, because we don't know what the `super` will be at compile
time. So the fix is for `mixinMembers` to handle it at run time.
Change-Id: I2b14ea437720bd26f2879c7daac5b3f796d48038
Reviewed-on: https://dart-review.googlesource.com/37645
Reviewed-by: Vijay Menon <vsm@google.com>
Commit-Queue: Jenny Messerly <jmesserly@google.com>
Jenny Messerly
16f8bbe68b