Remove Media.UnderflowCount, add Media.UnderflowDuration for MSE.

Remove Media.UnderflowCount, add Media.UnderflowDuration for MSE.

The counts can be inferred by the sample volume for UnderflowDuration,
so there's no need to track both.

BUG=641633
TEST=manually checked histograms in chrome://histograms.

Review-Url: https://codereview.chromium.org/2707973005
Cr-Commit-Position: refs/heads/master@{#452113}
Committed: https://chromium.googlesource.com/chromium/src/+/4f6d14dbe9482803495eaee9377c0f2816f8f2d9

[DaleCurtis, 2017-02-21 23:07:45]

dalecurtis@chromium.org changed reviewers:
+ chcunningham@chromium.org, isherman@chromium.org

[Ilya Sherman, 2017-02-21 23:14:10]

LGTM

[chcunningham, 2017-02-21 23:30:16]

lgtm

[DaleCurtis, 2017-02-21 23:35:02]

The CQ bit was checked by dalecurtis@chromium.org

[commit-bot: I haz the power, 2017-02-21 23:37:03]

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, 2017-02-22 01:40:23]

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

[commit-bot: I haz the power, 2017-02-22 01:40:25]

Try jobs failed on following builders:
  cast_shell_linux on master.tryserver.chromium.linux (JOB_TIMED_OUT, no build
URL)
  chromeos_amd64-generic_chromium_compile_only_ng on
master.tryserver.chromium.linux (JOB_TIMED_OUT, no build URL)
  chromium_presubmit on master.tryserver.chromium.linux (JOB_TIMED_OUT, no build
URL)
  linux_chromium_chromeos_ozone_rel_ng on master.tryserver.chromium.linux
(JOB_TIMED_OUT, no build URL)
  linux_chromium_compile_dbg_ng on master.tryserver.chromium.linux
(JOB_TIMED_OUT, no build URL)
  linux_chromium_rel_ng on master.tryserver.chromium.linux (JOB_TIMED_OUT, no
build URL)
  linux_chromium_tsan_rel_ng on master.tryserver.chromium.linux (JOB_TIMED_OUT,
no build URL)

[DaleCurtis, 2017-02-22 03:24:20]

The CQ bit was checked by dalecurtis@chromium.org

[commit-bot: I haz the power, 2017-02-22 03:25:38]

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, 2017-02-22 07:41:46]

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

[commit-bot: I haz the power, 2017-02-22 07:41:47]

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

[DaleCurtis, 2017-02-22 16:52:04]

The CQ bit was checked by dalecurtis@chromium.org

[commit-bot: I haz the power, 2017-02-22 16:52:41]

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, 2017-02-22 17:42:27]

CQ is committing da patch.

Bot data: {"patchset_id": 1, "attempt_start_ts": 1487782324068590, "parent_rev":
"3051b0d5f0603634df63e7919f26bde9b35d1d90", "commit_rev":
"4f6d14dbe9482803495eaee9377c0f2816f8f2d9"}

[commit-bot: I haz the power, 2017-02-22 17:43:01]

Description was changed from

==========
Remove Media.UnderflowCount, add Media.UnderflowDuration for MSE.

The counts can be inferred by the sample volume for UnderflowDuration,
so there's no need to track both.

BUG=641633
TEST=manually checked histograms in chrome://histograms.
==========

to

==========
Remove Media.UnderflowCount, add Media.UnderflowDuration for MSE.

The counts can be inferred by the sample volume for UnderflowDuration,
so there's no need to track both.

BUG=641633
TEST=manually checked histograms in chrome://histograms.

Review-Url: https://codereview.chromium.org/2707973005
Cr-Commit-Position: refs/heads/master@{#452113}
Committed:
https://chromium.googlesource.com/chromium/src/+/4f6d14dbe9482803495eaee9377c...
==========

[commit-bot: I haz the power, 2017-02-22 17:43:02]

Committed patchset #1 (id:1) as
https://chromium.googlesource.com/chromium/src/+/4f6d14dbe9482803495eaee9377c...