Add histogram entry for GpuVideoDecoder errors.

Add histogram entry for GpuVideoDecoder errors.

Not sure how we missed having these logged... Adding this also required
fixing the UMA enum name to match the media/ PRESUBMIT style: must end
with _MAX and that value must be equal to the last enum value.

BUG=598456
TEST=errors show up in chrome://histograms/Media.GpuVideoDecoderError.

Committed: https://crrev.com/64739369777e41880b12fbbeb6ad2ddd31f40053
Cr-Commit-Position: refs/heads/master@{#383640}

[DaleCurtis, 2016-03-28 22:47:59]

dalecurtis@chromium.org changed reviewers:
+ bbudge@chromium.org, holte@chromium.org

[DaleCurtis, 2016-03-28 22:48:00]

holte@ for UMA changes,
bbudge@ for trivial content/renderer/pepper changes.

[DaleCurtis, 2016-03-28 22:49:12]

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

[DaleCurtis, 2016-03-28 22:49:12]

+sandersd@ for media/ review

[Steven Holte, 2016-03-28 23:02:51]

lgtm

[sandersd (OOO until July 31), 2016-03-28 23:09:27]

lgtm

[bbudge, 2016-03-28 23:10:22]

content/renderer/pepper LGTM

[DaleCurtis, 2016-03-28 23:25:33]

The CQ bit was checked by dalecurtis@chromium.org

[commit-bot: I haz the power, 2016-03-28 23:25:48]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1839833002/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1839833002/1

[commit-bot: I haz the power, 2016-03-29 00:55:46]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-03-29 00:57:52]

Description was changed from

==========
Add histogram entry for GpuVideoDecoder errors.

Not sure how we missed having these logged... Adding this also required
fixing the UMA enum name to match the media/ PRESUBMIT style: must end
with _MAX and that value must be equal to the last enum value.

BUG=598456
TEST=errors show up in chrome://histograms/Media.GpuVideoDecoderError.
==========

to

==========
Add histogram entry for GpuVideoDecoder errors.

Not sure how we missed having these logged... Adding this also required
fixing the UMA enum name to match the media/ PRESUBMIT style: must end
with _MAX and that value must be equal to the last enum value.

BUG=598456
TEST=errors show up in chrome://histograms/Media.GpuVideoDecoderError.

Committed: https://crrev.com/64739369777e41880b12fbbeb6ad2ddd31f40053
Cr-Commit-Position: refs/heads/master@{#383640}
==========

[commit-bot: I haz the power, 2016-03-29 00:57:53]

Patchset 1 (id:??) landed as
https://crrev.com/64739369777e41880b12fbbeb6ad2ddd31f40053
Cr-Commit-Position: refs/heads/master@{#383640}