[tracing] r39794 follow-up: Update the missing part of the test.

[tracing] r39794 follow-up: Update the missing part of the test.

The test now checks the case when an observer is added after tracing is started.

BUG=chromium:406277
Committed: https://crrev.com/57b0e37443e7e9938f9e261d2e7c26a5688261f3
Cr-Commit-Position: refs/heads/master@{#39874}

[alph, 2016-09-28 07:10:19]

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

[commit-bot: I haz the power, 2016-09-28 07:10:21]

Dry run: CQ is trying da patch. Follow status at
 
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.chromium.or...

[alph, 2016-09-28 07:10:37]

alph@chromium.org changed reviewers:
+ caseq@chromium.org, fmeawad@chromium.org, jochen@chromium.org

[commit-bot: I haz the power, 2016-09-28 07:33:49]

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

[commit-bot: I haz the power, 2016-09-28 07:33:50]

Dry run: This issue passed the CQ dry run.

[fmeawad, 2016-09-28 18:13:56]

lgtm

Thanks.

[jochen (gone - plz use gerrit), 2016-09-29 12:07:27]

lgtm

[alph, 2016-09-29 14:32:36]

The CQ bit was checked by alph@chromium.org

[commit-bot: I haz the power, 2016-09-29 14:32:43]

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, 2016-09-29 15:13:29]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-09-29 15:13:56]

Description was changed from

==========
[tracing] r39794 follow-up: Update the missing part of the test.

The test now checks the case when an observer is added after tracing is started.

BUG=chromium:406277
==========

to

==========
[tracing] r39794 follow-up: Update the missing part of the test.

The test now checks the case when an observer is added after tracing is started.

BUG=chromium:406277

Committed: https://crrev.com/57b0e37443e7e9938f9e261d2e7c26a5688261f3
Cr-Commit-Position: refs/heads/master@{#39874}
==========

[commit-bot: I haz the power, 2016-09-29 15:13:59]

Patchset 1 (id:??) landed as
https://crrev.com/57b0e37443e7e9938f9e261d2e7c26a5688261f3
Cr-Commit-Position: refs/heads/master@{#39874}