Use ScopedTaskEnvironment instead of MessageLoopForUI in ui/aura/test/.

Use ScopedTaskEnvironment instead of MessageLoopForUI in ui/aura/test/.

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

TBR=sky@chromium.org
BUG=708584
Review-Url: https://codereview.chromium.org/2849423002
Cr-Commit-Position: refs/heads/master@{#468756}
Committed: https://chromium.googlesource.com/chromium/src/+/1c906dc6495ff5c831a19b72a1f8fb265d1eacf6

[fdoray, 2017-05-02 13:38:43]

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

[commit-bot: I haz the power, 2017-05-02 13:39:00]

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, 2017-05-02 13:43:36]

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

[commit-bot: I haz the power, 2017-05-02 13:43:37]

Dry run: Try jobs failed on following builders:
  linux_chromium_chromeos_ozone_rel_ng on master.tryserver.chromium.linux
(JOB_FAILED,
http://build.chromium.org/p/tryserver.chromium.linux/builders/linux_chromium_...)

[fdoray, 2017-05-02 13:58:08]

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

[commit-bot: I haz the power, 2017-05-02 13:58:27]

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, 2017-05-02 15:06:28]

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

[commit-bot: I haz the power, 2017-05-02 15:06:29]

Dry run: This issue passed the CQ dry run.

[fdoray, 2017-05-02 17:43:41]

fdoray@chromium.org changed reviewers:
+ gab@chromium.org, robliao@chromium.org

[fdoray, 2017-05-02 17:43:42]

gab@ or robliao@: PTAL

This is a prerequisite to migrate v8 from WorkerPool to TaskScheduler.

[gab, 2017-05-02 17:59:12]

On 2017/05/02 17:43:42, fdoray wrote:
> gab@ or robliao@: PTAL
> 
> This is a prerequisite to migrate v8 from WorkerPool to TaskScheduler.

lgtm

[fdoray, 2017-05-02 17:59:56]

The CQ bit was checked by fdoray@chromium.org

[fdoray, 2017-05-02 17:59:56]

The CQ bit was unchecked by fdoray@chromium.org

[fdoray, 2017-05-02 18:01:01]

fdoray@chromium.org changed reviewers:
+ jam@chromium.org, sky@chromium.org

[fdoray, 2017-05-02 18:01:02]

jam@: Please review changes in content/

sky@: Please review changes in ui/

[jam, 2017-05-02 19:58:55]

On 2017/05/02 18:01:02, fdoray wrote:
> jam@: Please review changes in content/
lgtm
> 
> sky@: Please review changes in ui/

[fdoray, 2017-05-02 20:08:05]

Description was changed from

==========
Use ScopedTaskEnvironment instead of MessageLoopForUI in ui/aura/test/.

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
==========

to

==========
Use ScopedTaskEnvironment instead of MessageLoopForUI in ui/aura/test/.

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...

TBR=sky@chromium.org
BUG=708584
==========

[fdoray, 2017-05-02 20:08:09]

The CQ bit was checked by fdoray@chromium.org

[commit-bot: I haz the power, 2017-05-02 20:08:51]

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, 2017-05-02 20:15:47]

CQ is committing da patch.

Bot data: {"patchset_id": 20001, "attempt_start_ts": 1493755689632640,
"parent_rev": "f2bcb74ba267b64bceec1afeb19eceaa4790c2c8", "commit_rev":
"1c906dc6495ff5c831a19b72a1f8fb265d1eacf6"}

[commit-bot: I haz the power, 2017-05-02 20:15:55]

Description was changed from

==========
Use ScopedTaskEnvironment instead of MessageLoopForUI in ui/aura/test/.

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...

TBR=sky@chromium.org
BUG=708584
==========

to

==========
Use ScopedTaskEnvironment instead of MessageLoopForUI in ui/aura/test/.

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...

TBR=sky@chromium.org
BUG=708584

Review-Url: https://codereview.chromium.org/2849423002
Cr-Commit-Position: refs/heads/master@{#468756}
Committed:
https://chromium.googlesource.com/chromium/src/+/1c906dc6495ff5c831a19b72a1f8...
==========

[commit-bot: I haz the power, 2017-05-02 20:15:56]

Committed patchset #2 (id:20001) as
https://chromium.googlesource.com/chromium/src/+/1c906dc6495ff5c831a19b72a1f8...