add gamma value to deviceproperties

add gamma value to deviceproperties

BUG=skia:

Committed: https://skia.googlesource.com/skia/+/b2d77e4d7458145ef4825c28323d9fbbb6b003ac

[reed1, 2014-10-14 14:02:01]

reed@google.com changed reviewers:
+ bungeman@google.com, djsollen@google.com

[reed1, 2014-10-14 14:02:05]

The CQ bit was checked by reed@google.com

[commit-bot: I haz the power, 2014-10-14 14:02:58]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/652273002/1

[commit-bot: I haz the power, 2014-10-14 14:02:59]

Note for Reviewers:
The CQ is waiting for an approval.
If you believe that the CL is not ready yet, or if you would like to L-G-T-M
with comments then please uncheck the CQ checkbox.

Waiting for LGTM from valid reviewer(s) till 2014-10-14 20:02 UTC

[djsollen, 2014-10-14 14:05:35]

lgtm

[reed1, 2014-10-14 14:07:08]

The CQ bit was unchecked by reed@google.com

[reed1, 2014-10-14 14:10:29]

waiting on bungeman...

[bungeman-skia, 2014-10-14 15:02:53]

lgtm

[reed1, 2014-10-14 15:25:15]

The CQ bit was checked by reed@google.com

[commit-bot: I haz the power, 2014-10-14 15:26:28]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/652273002/1

[commit-bot: I haz the power, 2014-10-14 15:26:41]

Committed patchset #1 (id:1) as b2d77e4d7458145ef4825c28323d9fbbb6b003ac