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This also allows searching for mixin(s), which we test now. R=brianwilkerson@google.com Change-Id: I6c1944db0e6ecbc0f7352188968e53ef38603426 Reviewed-on: https://dart-review.googlesource.com/72554 Commit-Queue: Konstantin Shcheglov <scheglov@google.com> Reviewed-by: Brian Wilkerson <brianwilkerson@google.com>