Handle "fail_" style tests in reflective tests.

Handle "fail_" style tests in reflective tests.

There is one corner case we don't handle--we don't catch the case
where the test is expected to fail, but the failure comes from an
asynchronous callback invoked via expectAsync().  Fortunately
expectAsync() is rare enough that this doesn't cause a problem with
any of our existing "fail_" style tests.

R=scheglov@google.com

Committed: https://code.google.com/p/dart/source/detail?r=42180

[Paul Berry, 2014-12-08 19:45:35]

paulberry@google.com changed reviewers:
+ scheglov@google.com

[scheglov, 2014-12-08 19:48:25]

LGTM

Do you want to update also the second copy of reflective_tests.dart in the
analysis_server package?

[Paul Berry, 2014-12-08 20:32:52]

On 2014/12/08 19:48:25, scheglov wrote:
> LGTM
> 
> Do you want to update also the second copy of reflective_tests.dart in the
> analysis_server package?

Good point--I didn't realize there were two copies of that file.  Done.

(I also went ahead and fixed a difference between the two:
analyzer/test/reflective_tests.dart was missing a MirrorsUsed annotation.)

[Paul Berry, 2014-12-08 20:33:33]

Committed patchset #1 (id:1) manually as 42180 (presubmit successful).