Add rappor metrics to track Media Session API usage

Add rappor metrics to track Media Session API usage

BUG=685615
Review-Url: https://codereview.chromium.org/2651203005
Cr-Commit-Position: refs/heads/master@{#446839}
Committed: https://chromium.googlesource.com/chromium/src/+/ba54980e209fedd167b84a09b7a075f4c7d5bbf5

[Zhiqiang Zhang (Slow), 2017-01-26 18:14:15]

zqzhang@chromium.org changed reviewers:
+ mlamouri@chromium.org

[mlamouri (slow - plz ping), 2017-01-27 04:40:15]

lgtm

[Zhiqiang Zhang (Slow), 2017-01-27 08:17:47]

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

[commit-bot: I haz the power, 2017-01-27 08:18:03]

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

[Zhiqiang Zhang (Slow), 2017-01-27 08:18:20]

zqzhang@chromium.org changed reviewers:
+ isherman@chromium.org

[Zhiqiang Zhang (Slow), 2017-01-27 08:18:20]

+isherman for approval

[commit-bot: I haz the power, 2017-01-27 09:50:23]

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

[commit-bot: I haz the power, 2017-01-27 09:50:24]

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...)

[Zhiqiang Zhang (Slow), 2017-01-27 09:59:53]

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

[commit-bot: I haz the power, 2017-01-27 10:00:03]

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, 2017-01-27 10:36:40]

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

[commit-bot: I haz the power, 2017-01-27 10:36:41]

Dry run: This issue passed the CQ dry run.

[Ilya Sherman, 2017-01-27 22:57:13]

LGTM

[mlamouri (slow - plz ping), 2017-01-27 23:51:34]

The CQ bit was checked by mlamouri@chromium.org

[commit-bot: I haz the power, 2017-01-27 23:52:04]

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, 2017-01-27 23:57:13]

CQ is committing da patch.

Bot data: {"patchset_id": 20001, "attempt_start_ts": 1485561094636410,
"parent_rev": "b9c7574d2f2d7baaf78d42c5db8068fed0081145", "commit_rev":
"ba54980e209fedd167b84a09b7a075f4c7d5bbf5"}

[commit-bot: I haz the power, 2017-01-27 23:58:00]

Description was changed from

==========
Add rappor metrics to track Media Session API usage

BUG=685615
==========

to

==========
Add rappor metrics to track Media Session API usage

BUG=685615

Review-Url: https://codereview.chromium.org/2651203005
Cr-Commit-Position: refs/heads/master@{#446839}
Committed:
https://chromium.googlesource.com/chromium/src/+/ba54980e209fedd167b84a09b7a0...
==========

[commit-bot: I haz the power, 2017-01-27 23:58:01]

Committed patchset #2 (id:20001) as
https://chromium.googlesource.com/chromium/src/+/ba54980e209fedd167b84a09b7a0...