[Blink] Check thread access in UserGestureIndicator

[Blink] Check thread access in UserGestureIndicator

We silently ignore UserGestureIndicators on non-main threads, but tried
checking equality against s_rootToken before checking the thread. Check
the thread before token equality.

BUG=662710
Committed: https://crrev.com/28da3bf9d966cb3048f4dff0284f2173ecb5c5e7
Cr-Commit-Position: refs/heads/master@{#430450}

[Devlin, 2016-11-07 22:09:40]

The CQ bit was checked by rdevlin.cronin@chromium.org to run a CQ dry run

[commit-bot: I haz the power, 2016-11-07 22:10:09]

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

[Devlin, 2016-11-07 22:57:38]

rdevlin.cronin@chromium.org changed reviewers:
+ haraken@chromium.org

[Devlin, 2016-11-07 22:57:38]

haraken@, mind taking a look?

This is in response to
https://chromium.googlesource.com/chromium/src/+/b1ae4b4c9d29625f4ab07eadbeac...,
which was reviewed by japhet@ and jochen@, but they're both out for a little
while.

[haraken, 2016-11-07 23:35:57]

LGTM

[commit-bot: I haz the power, 2016-11-08 00:01:02]

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

[commit-bot: I haz the power, 2016-11-08 00:01:03]

Dry run: This issue passed the CQ dry run.

[Devlin, 2016-11-08 00:45:24]

The CQ bit was checked by rdevlin.cronin@chromium.org

[commit-bot: I haz the power, 2016-11-08 00:46:07]

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, 2016-11-08 00:52:17]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-11-08 00:57:50]

Description was changed from

==========
[Blink] Check thread access in UserGestureIndicator

We silently ignore UserGestureIndicators on non-main threads, but tried
checking equality against s_rootToken before checking the thread. Check
the thread before token equality.

BUG=662710
==========

to

==========
[Blink] Check thread access in UserGestureIndicator

We silently ignore UserGestureIndicators on non-main threads, but tried
checking equality against s_rootToken before checking the thread. Check
the thread before token equality.

BUG=662710

Committed: https://crrev.com/28da3bf9d966cb3048f4dff0284f2173ecb5c5e7
Cr-Commit-Position: refs/heads/master@{#430450}
==========

[commit-bot: I haz the power, 2016-11-08 00:57:51]

Patchset 1 (id:??) landed as
https://crrev.com/28da3bf9d966cb3048f4dff0284f2173ecb5c5e7
Cr-Commit-Position: refs/heads/master@{#430450}