Fix crash in blocked input event warning.

Fix crash in blocked input event warning.

If event does not come from JS, we should enter the context scope.

BUG=617229
Committed: https://crrev.com/ba936770ca24f657b27361611cc0a0e4939c080b
Cr-Commit-Position: refs/heads/master@{#397928}

[dgozman, 2016-06-04 02:08:34]

dgozman@chromium.org changed reviewers:
+ adamk@chromium.org, caseq@chromium.org

[dgozman, 2016-06-04 02:08:35]

Take a look please.

I wasn't able to write a test easily - it involves too many moving parts and has
to be done not from JavaScript.

[caseq, 2016-06-04 02:22:11]

lgtm

[dgozman, 2016-06-04 04:57:40]

The CQ bit was checked by dgozman@chromium.org

[commit-bot: I haz the power, 2016-06-04 04:57:53]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/2039453003/1

[commit-bot: I haz the power, 2016-06-04 08:56:46]

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

[commit-bot: I haz the power, 2016-06-04 08:56:46]

Try jobs failed on following builders:
  win_chromium_rel_ng on tryserver.chromium.win (JOB_FAILED,
http://build.chromium.org/p/tryserver.chromium.win/builders/win_chromium_rel_...)

[dgozman, 2016-06-04 14:12:29]

The CQ bit was checked by dgozman@chromium.org

[commit-bot: I haz the power, 2016-06-04 14:12:33]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/2039453003/1

[commit-bot: I haz the power, 2016-06-04 15:58:37]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-06-04 16:01:03]

Description was changed from

==========
Fix crash in blocked input event warning.

If event does not come from JS, we should enter the context scope.

BUG=617229
==========

to

==========
Fix crash in blocked input event warning.

If event does not come from JS, we should enter the context scope.

BUG=617229

Committed: https://crrev.com/ba936770ca24f657b27361611cc0a0e4939c080b
Cr-Commit-Position: refs/heads/master@{#397928}
==========

[commit-bot: I haz the power, 2016-06-04 16:01:04]

Patchset 1 (id:??) landed as
https://crrev.com/ba936770ca24f657b27361611cc0a0e4939c080b
Cr-Commit-Position: refs/heads/master@{#397928}