Update VideoPixelFormat histogram enum with YV12HD.

Add YV12HD to VideoPixelFormat histogram enum.

This value corresponds to media::VideoFrame::YV12HD which was added in a previous CL.

BUG=None

Committed: https://crrev.com/c3273cc974f2e64964a77478dc33fa9eadc72b9c
Cr-Commit-Position: refs/heads/master@{#317714}

[watk, 2015-02-21 01:05:24]

watk@chromium.org changed reviewers:
+ rileya@chromium.org

[rileya (GONE FROM CHROMIUM), 2015-02-21 01:08:00]

LGTM (not an OWNER though)

[DaleCurtis, 2015-02-21 01:14:42]

dalecurtis@chromium.org changed reviewers:
+ dalecurtis@chromium.org

[DaleCurtis, 2015-02-21 01:14:43]

lgtm

[watk, 2015-02-23 17:46:42]

watk@chromium.org changed reviewers:
+ asvitkine@chromium.org

[watk, 2015-02-23 17:47:38]

Adding asvitkine as owner

[Alexei Svitkine (slow), 2015-02-23 17:48:22]

The CQ bit was checked by asvitkine@chromium.org

[Alexei Svitkine (slow), 2015-02-23 17:48:22]

lgtm

[commit-bot: I haz the power, 2015-02-23 17:49:25]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/948633002/1

[commit-bot: I haz the power, 2015-02-23 17:52:57]

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

[commit-bot: I haz the power, 2015-02-23 17:52:57]

Try jobs failed on following builders:
  ios_dbg_simulator on tryserver.chromium.mac (JOB_FAILED,
http://build.chromium.org/p/tryserver.chromium.mac/builders/ios_dbg_simulator...)

[watk, 2015-02-23 18:29:06]

The CQ bit was checked by watk@chromium.org

[commit-bot: I haz the power, 2015-02-23 18:29:44]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/948633002/1

[commit-bot: I haz the power, 2015-02-23 18:33:07]

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

[commit-bot: I haz the power, 2015-02-23 18:33:08]

Try jobs failed on following builders:
  ios_dbg_simulator on tryserver.chromium.mac (JOB_FAILED,
http://build.chromium.org/p/tryserver.chromium.mac/builders/ios_dbg_simulator...)

[watk, 2015-02-23 23:56:18]

The CQ bit was checked by watk@chromium.org

[commit-bot: I haz the power, 2015-02-23 23:57:50]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/948633002/1

[commit-bot: I haz the power, 2015-02-24 01:08:47]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-02-24 01:09:36]

Patchset 1 (id:??) landed as
https://crrev.com/c3273cc974f2e64964a77478dc33fa9eadc72b9c
Cr-Commit-Position: refs/heads/master@{#317714}