Add test for cancel-future being awaited after an `await for`.

Add test for cancel-future being awaited after an `await for`.

See http://dartbug.com/28974 (#28974)

R=floitsch@google.com

Committed: https://github.com/dart-lang/sdk/commit/74a8351fb6ccb6789c9195a4b4905d853090d4e7
Committed: https://github.com/dart-lang/sdk/commit/86d119e1ed354bb489237c815a358f04d1242158

[Lasse Reichstein Nielsen, 2017-03-07 10:59:33]

lrn@google.com changed reviewers:
+ floitsch@google.com

[floitsch, 2017-03-07 12:31:18]

LGTM.

https://codereview.chromium.org/2734143002/diff/20001/tests/language/await_fo...
File tests/language/await_for_test.dart (right):

https://codereview.chromium.org/2734143002/diff/20001/tests/language/await_fo...
tests/language/await_for_test.dart:68: /// Creates a stream that yields integers
forever, but throws when cancelled.
canceled

[Lasse Reichstein Nielsen, 2017-03-07 17:05:41]

Description was changed from

==========
Add test for cancel-future being awaited after an `await for`.

See http://dartbug.com/28974 (#28974)
==========

to

==========
Add test for cancel-future being awaited after an `await for`.

See http://dartbug.com/28974 (#28974)

R=floitsch@google.com

Committed:
https://github.com/dart-lang/sdk/commit/74a8351fb6ccb6789c9195a4b4905d853090d4e7
==========

[Lasse Reichstein Nielsen, 2017-03-07 17:05:42]

Committed patchset #4 (id:60001) manually as
74a8351fb6ccb6789c9195a4b4905d853090d4e7 (presubmit successful).

[Alan Knight, 2017-03-07 19:22:59]

alanknight@google.com changed reviewers:
+ alanknight@google.com

[Alan Knight, 2017-03-07 19:23:00]

This is causing failures on Dartium. Reverting

[Lasse Reichstein Nielsen, 2017-03-09 08:50:13]

Description was changed from

==========
Add test for cancel-future being awaited after an `await for`.

See http://dartbug.com/28974 (#28974)

R=floitsch@google.com

Committed:
https://github.com/dart-lang/sdk/commit/74a8351fb6ccb6789c9195a4b4905d853090d4e7
==========

to

==========
Add test for cancel-future being awaited after an `await for`.

See http://dartbug.com/28974 (#28974)

R=floitsch@google.com

Committed:
https://github.com/dart-lang/sdk/commit/74a8351fb6ccb6789c9195a4b4905d853090d4e7
Committed:
https://github.com/dart-lang/sdk/commit/86d119e1ed354bb489237c815a358f04d1242158
==========

[Lasse Reichstein Nielsen, 2017-03-09 08:50:14]

Committed patchset #5 (id:80001) manually as
86d119e1ed354bb489237c815a358f04d1242158 (presubmit successful).