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Add Expect.allIdentical to complement Expect.allDistinct. Change-Id: I65e4e0005f141434bd8fb47d9c60153f32b293aa Reviewed-on: https://dart-review.googlesource.com/50421 Reviewed-by: Dmitry Stefantsov <dmitryas@google.com> Commit-Queue: Lasse R.H. Nielsen <lrn@google.com>