Use ScopedTaskEnvironment instead of MessageLoopForUI in device tests.

Use ScopedTaskEnvironment instead of MessageLoopForUI in device tests.

ScopedTaskEnvironment allows usage of ThreadTaskRunnerHandle and
base/task_scheduler/post_task.h within its scope. It should be
instantiated in everytest that uses either of these APIs
(i.e. no test should instantiate a MessageLoop directly).

Motivation for ScopedTaskEnvironment can be found in:
https://docs.google.com/document/d/1QabRo8c7D9LsYY3cEcaPQbOCLo8Tu-6VLykYXyl3Pkk/edit

BUG=708584
R=gab@chromium.org
TBR=reillyg@chromium.org

Review-Url: https://codereview.chromium.org/2849613002
Cr-Commit-Position: refs/heads/master@{#467760}
Committed: https://chromium.googlesource.com/chromium/src/+/27ff7475715673ebc736e4b198c3e90696d83022

[fdoray, 2017-04-27 18:31:18]

The CQ bit was checked by fdoray@chromium.org to run a CQ dry run

[fdoray, 2017-04-27 18:31:20]

gab@: PTAL

The change will then be TBRed to the owner.

[commit-bot: I haz the power, 2017-04-27 18:32:04]

Dry run: CQ is trying da patch.

Follow status at:
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.chromium.or...

[commit-bot: I haz the power, 2017-04-27 18:40:31]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2017-04-27 18:40:32]

Dry run: Try jobs failed on following builders:
  linux_android_rel_ng on master.tryserver.chromium.android (JOB_FAILED,
https://build.chromium.org/p/tryserver.chromium.android/builders/linux_androi...)

[fdoray, 2017-04-27 18:49:32]

The CQ bit was checked by fdoray@chromium.org to run a CQ dry run

[commit-bot: I haz the power, 2017-04-27 18:49:55]

Dry run: CQ is trying da patch.

Follow status at:
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.chromium.or...

[Reilly Grant (use Gerrit), 2017-04-27 19:01:44]

lgtm

[fdoray, 2017-04-27 19:07:30]

The CQ bit was unchecked by fdoray@chromium.org

[fdoray, 2017-04-27 19:07:33]

The CQ bit was checked by fdoray@chromium.org

[commit-bot: I haz the power, 2017-04-27 19:08:23]

CQ is trying da patch.

Follow status at:
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.chromium.or...

[commit-bot: I haz the power, 2017-04-27 19:41:18]

CQ is committing da patch.

Bot data: {"patchset_id": 20001, "attempt_start_ts": 1493320053832890,
"parent_rev": "ca6cb1bca33700042f30ef9ffd6813b88aa37f36", "commit_rev":
"27ff7475715673ebc736e4b198c3e90696d83022"}

[commit-bot: I haz the power, 2017-04-27 19:41:35]

Description was changed from

==========
Use ScopedTaskEnvironment instead of MessageLoopForUI in device tests.

ScopedTaskEnvironment allows usage of ThreadTaskRunnerHandle and
base/task_scheduler/post_task.h within its scope. It should be
instantiated in everytest that uses either of these APIs
(i.e. no test should instantiate a MessageLoop directly).

Motivation for ScopedTaskEnvironment can be found in:
https://docs.google.com/document/d/1QabRo8c7D9LsYY3cEcaPQbOCLo8Tu-6VLykYXyl3P...

BUG=708584
R=gab@chromium.org
TBR=reillyg@chromium.org
==========

to

==========
Use ScopedTaskEnvironment instead of MessageLoopForUI in device tests.

ScopedTaskEnvironment allows usage of ThreadTaskRunnerHandle and
base/task_scheduler/post_task.h within its scope. It should be
instantiated in everytest that uses either of these APIs
(i.e. no test should instantiate a MessageLoop directly).

Motivation for ScopedTaskEnvironment can be found in:
https://docs.google.com/document/d/1QabRo8c7D9LsYY3cEcaPQbOCLo8Tu-6VLykYXyl3P...

BUG=708584
R=gab@chromium.org
TBR=reillyg@chromium.org

Review-Url: https://codereview.chromium.org/2849613002
Cr-Commit-Position: refs/heads/master@{#467760}
Committed:
https://chromium.googlesource.com/chromium/src/+/27ff7475715673ebc736e4b198c3...
==========

[commit-bot: I haz the power, 2017-04-27 19:41:37]

Committed patchset #2 (id:20001) as
https://chromium.googlesource.com/chromium/src/+/27ff7475715673ebc736e4b198c3...