Reland Queue commands to the Os to start a video device.

Reland Queue commands to the Os to start a video device.

This cl reland Queue commands to the Os to start a video device, originally reviewed in https://codereview.chromium.org/801363002. (patchset 1)
In patchset 2, the issue found in crbug/450382 related to patchset(1) is addressed. |Device| is made into a class and thread checks are added.

BUG=428891, 450382, 450226
Committed: https://crrev.com/58af7960deb5d850cde69b90f119dd00d298a191
Cr-Commit-Position: refs/heads/master@{#313708}

[perkj_chrome, 2015-01-21 15:08:48]

perkj@chromium.org changed reviewers:
+ tommi@chromium.org

[perkj_chrome, 2015-01-21 15:08:48]

Can you please take a look?

[tommi (sloooow) - chröme, 2015-01-23 10:28:34]

The CQ bit was checked by tommi@chromium.org

[tommi (sloooow) - chröme, 2015-01-23 10:28:34]

lgtm

[commit-bot: I haz the power, 2015-01-23 10:29:34]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/862063002/20001

[commit-bot: I haz the power, 2015-01-23 10:29:55]

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

[commit-bot: I haz the power, 2015-01-23 10:29:55]

Try jobs failed on following builders:
  win_gpu on tryserver.chromium.gpu
(http://build.chromium.org/p/tryserver.chromium.gpu/builders/win_gpu/builds/11...)
  win_gpu_triggered_tests on tryserver.chromium.gpu
(http://build.chromium.org/p/tryserver.chromium.gpu/builders/win_gpu_triggered...)

[perkj_chrome, 2015-01-26 17:46:45]

Tommi- can you please take a look at the latest patchset?

[perkj_chrome, 2015-01-29 07:49:47]

On 2015/01/26 17:46:45, perkj wrote:
> Tommi- can you please take a look at the latest patchset?

Tommi, please?

[tommi (sloooow) - chröme, 2015-01-29 14:19:50]

lgtm

[perkj_chrome, 2015-01-29 14:37:43]

The CQ bit was checked by perkj@chromium.org

[commit-bot: I haz the power, 2015-01-29 14:38:40]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/862063002/80001

[commit-bot: I haz the power, 2015-01-29 15:24:43]

Committed patchset #5 (id:80001)

[commit-bot: I haz the power, 2015-01-29 15:26:32]

Patchset 5 (id:??) landed as
https://crrev.com/58af7960deb5d850cde69b90f119dd00d298a191
Cr-Commit-Position: refs/heads/master@{#313708}