commit 66a9a083d5158d54b7db7aecd60175fb96e6dc0b
author fdoray <fdoray@chromium.org> Mon May 01 18:31:27 2017
committer Commit bot <commit-bot@chromium.org> Mon May 01 18:31:27 2017
tree a7ea7ac2bdc92031e5c08f0be379a4d06c7e364b
parent a03ce481e33b012c70d864788a2c18568128d8cc

Use ScopedTaskEnvironment instead of MessageLoopForUI in components 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=sdefresne@chromium.org

Review-Url: https://codereview.chromium.org/2846723005
Cr-Commit-Position: refs/heads/master@{#468361}