Enable QP parsing from CABAC bitstreams

Enable QP parsing from CABAC bitstreams

This was added a while back in d020f3fea but dissapeared during a
rebase. This CL adds it back.

BUG=webrtc:6338
R=magjed@webrtc.org

Committed: https://crrev.com/ab6996dc103f2fcda810477b0b014bb02ebae8b1
Cr-Commit-Position: refs/heads/master@{#15194}

[kthelgason, 2016-11-22 14:20:56]

PTAL.

FYI, I tested quality scaling with this patch and 2521103003,
and it worked fine with the current thresholds. The difference in average QP
should not be that big, at least not according to my preliminary tests.

[magjed_webrtc, 2016-11-22 14:27:59]

lgtm

[kthelgason, 2016-11-22 14:28:53]

The CQ bit was checked by kthelgason@webrtc.org

[commit-bot: I haz the power, 2016-11-22 14:29:02]

CQ is trying da patch. Follow status at
 
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.webrtc.org/...

[commit-bot: I haz the power, 2016-11-22 14:53:31]

CQ is committing da patch.

Bot data: {"patchset_id": 1, "attempt_start_ts": 1479824933026010, "parent_rev":
"e28ef1a874d67bd4fb5fb451f9b4bb5629936841", "commit_rev":
"636a17290081e71c17f4ea791daf745802d32f93"}

[commit-bot: I haz the power, 2016-11-22 14:53:34]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-11-22 14:53:45]

Description was changed from

==========
Enable QP parsing from CABAC bitstreams

This was added a while back in d020f3fea but dissapeared during a
rebase. This CL adds it back.

BUG=webrtc:6338
R=magjed@webrtc.org
==========

to

==========
Enable QP parsing from CABAC bitstreams

This was added a while back in d020f3fea but dissapeared during a
rebase. This CL adds it back.

BUG=webrtc:6338
R=magjed@webrtc.org

Committed: https://crrev.com/ab6996dc103f2fcda810477b0b014bb02ebae8b1
Cr-Commit-Position: refs/heads/master@{#15194}
==========

[commit-bot: I haz the power, 2016-11-22 14:53:45]

Patchset 1 (id:??) landed as
https://crrev.com/ab6996dc103f2fcda810477b0b014bb02ebae8b1
Cr-Commit-Position: refs/heads/master@{#15194}