V4L2VDA: fix starting the device poll thread twice.

V4L2VDA: fix starting the device poll thread twice.

Starting the thread twice happened in the following steps.
(1) V4L2VDA gets a Flush.
(2) Before Flush is done, V4L2VDA gets a Reset.

This patch checks if the device poll thread is started before
starting it in ResetDoneTask.

BUG=chrome-os-partner:59921
BUG=chromium:664112
TEST=Scroll in Android Twitter app.
CQ_INCLUDE_TRYBOTS=master.tryserver.chromium.linux:linux_optional_gpu_tests_rel;master.tryserver.chromium.mac:mac_optional_gpu_tests_rel;master.tryserver.chromium.win:win_optional_gpu_tests_rel

Committed: https://crrev.com/6a904bfb30b37705209bb2d5e1b9cc3b079319b3
Cr-Commit-Position: refs/heads/master@{#432853}

[wuchengli, 2016-11-17 07:56:35]

Description was changed from

==========
V4L2VDA: fix starting the device poll thread twice.

Starting the thread twice happened in the following steps.
(1) V4L2VDA gets a Flush.
(2) Before Flush is done, V4L2VDA gets a Reset.

This patch checks if the device poll thread is started before
starting it in ResetDoneTask.

BUG=chrome-os-partner:59921
BUG=chromium:664112
TEST=Scroll in Android Twitter app.
==========

to

==========
V4L2VDA: fix starting the device poll thread twice.

Starting the thread twice happened in the following steps.
(1) V4L2VDA gets a Flush.
(2) Before Flush is done, V4L2VDA gets a Reset.

This patch checks if the device poll thread is started before
starting it in ResetDoneTask.

BUG=chrome-os-partner:59921
BUG=chromium:664112
TEST=Scroll in Android Twitter app.
CQ_INCLUDE_TRYBOTS=master.tryserver.chromium.linux:linux_optional_gpu_tests_rel;master.tryserver.chromium.mac:mac_optional_gpu_tests_rel;master.tryserver.chromium.win:win_optional_gpu_tests_rel
==========

[wuchengli, 2016-11-17 08:18:48]

wuchengli@chromium.org changed reviewers:
+ kcwu@chromium.org, posciak@chromium.org

[wuchengli, 2016-11-17 08:18:49]

PTAL

[kcwu, 2016-11-17 08:31:22]

lgtm

[wuchengli, 2016-11-17 12:16:04]

The CQ bit was checked by wuchengli@chromium.org

[commit-bot: I haz the power, 2016-11-17 12:16:16]

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

[commit-bot: I haz the power, 2016-11-17 13:11:04]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-11-17 13:15:30]

Description was changed from

==========
V4L2VDA: fix starting the device poll thread twice.

Starting the thread twice happened in the following steps.
(1) V4L2VDA gets a Flush.
(2) Before Flush is done, V4L2VDA gets a Reset.

This patch checks if the device poll thread is started before
starting it in ResetDoneTask.

BUG=chrome-os-partner:59921
BUG=chromium:664112
TEST=Scroll in Android Twitter app.
CQ_INCLUDE_TRYBOTS=master.tryserver.chromium.linux:linux_optional_gpu_tests_rel;master.tryserver.chromium.mac:mac_optional_gpu_tests_rel;master.tryserver.chromium.win:win_optional_gpu_tests_rel
==========

to

==========
V4L2VDA: fix starting the device poll thread twice.

Starting the thread twice happened in the following steps.
(1) V4L2VDA gets a Flush.
(2) Before Flush is done, V4L2VDA gets a Reset.

This patch checks if the device poll thread is started before
starting it in ResetDoneTask.

BUG=chrome-os-partner:59921
BUG=chromium:664112
TEST=Scroll in Android Twitter app.
CQ_INCLUDE_TRYBOTS=master.tryserver.chromium.linux:linux_optional_gpu_tests_rel;master.tryserver.chromium.mac:mac_optional_gpu_tests_rel;master.tryserver.chromium.win:win_optional_gpu_tests_rel

Committed: https://crrev.com/6a904bfb30b37705209bb2d5e1b9cc3b079319b3
Cr-Commit-Position: refs/heads/master@{#432853}
==========

[commit-bot: I haz the power, 2016-11-17 13:15:31]

Patchset 1 (id:??) landed as
https://crrev.com/6a904bfb30b37705209bb2d5e1b9cc3b079319b3
Cr-Commit-Position: refs/heads/master@{#432853}