Rewrite thread_watcher_test.

Rewrite thread_watcher_test.

R=sergiyb@chromium.org
BUG=

Committed: https://chromium.googlesource.com/infra/testing/testing_support/+/f2f2a3a000e40166572142c1ad88b48bbdbe2a68

[Sergiy Byelozyorov, 2016-07-07 10:20:39]

I am not sure if using ThreadWatcherMixIn directly is good idea because this way
we are not testing the module in the way users are using it (by inheriting from
thread_watcher.TestCase). But I know this is PITA, so I'm fine with whatever
solution you will end up with. LGTM

[tandrii(chromium), 2016-07-07 11:33:57]

https://codereview.chromium.org/2125133003/diff/20001/testing_support/tests/t...
File testing_support/tests/thread_watcher_test.py (right):

https://codereview.chromium.org/2125133003/diff/20001/testing_support/tests/t...
testing_support/tests/thread_watcher_test.py:89: class
ThreadWatcherTestCaseUsageTest(thread_watcher.TestCase):
testing actual usage turned out to be very simple

[tandrii(chromium), 2016-07-07 11:34:31]

Description was changed from

==========
Rewrite thread_watcher_test.

R=sergiyb@chromium.org
BUG=
==========

to

==========
Rewrite thread_watcher_test.

R=sergiyb@chromium.org
BUG=

Committed:
https://chromium.googlesource.com/infra/testing/testing_support/+/f2f2a3a000e...
==========

[tandrii(chromium), 2016-07-07 11:34:32]

Committed patchset #2 (id:20001) manually as
f2f2a3a000e40166572142c1ad88b48bbdbe2a68 (presubmit successful).

[Sergiy Byelozyorov, 2016-07-08 08:22:13]

https://codereview.chromium.org/2125133003/diff/20001/testing_support/tests/t...
File testing_support/tests/thread_watcher_test.py (right):

https://codereview.chromium.org/2125133003/diff/20001/testing_support/tests/t...
testing_support/tests/thread_watcher_test.py:89: class
ThreadWatcherTestCaseUsageTest(thread_watcher.TestCase):
On 2016/07/07 11:33:57, tandrii(chromium) wrote:
> testing actual usage turned out to be very simple

Awesome. Thanks.