Add DCHECKs for thread access PermissionManager.

Add DCHECKs for thread access PermissionManager.

The PermissionManager is not thread safe. Lets add some DCHECKs to
let us know when there is an unsafe access.

BUG=658018
R=jochen

Committed: https://crrev.com/0ebc1f3b8cc7caef42f24aad8bd88fe1f9c3856e
Cr-Commit-Position: refs/heads/master@{#426793}

[dougt, 2016-10-20 22:29:17]

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

[commit-bot: I haz the power, 2016-10-20 22:30:14]

Dry run: 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, 2016-10-20 23:59:48]

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

[commit-bot: I haz the power, 2016-10-20 23:59:49]

Dry run: This issue passed the CQ dry run.

[dougt, 2016-10-21 00:03:34]

Hi jochen, please take a look.

[jochen (gone - plz use gerrit), 2016-10-21 11:01:30]

lgtm

[dougt, 2016-10-21 14:59:23]

The CQ bit was checked by dougt@chromium.org

[commit-bot: I haz the power, 2016-10-21 14:59:36]

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, 2016-10-21 15:09:49]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-10-21 15:34:02]

Description was changed from

==========
Add DCHECKs for thread access PermissionManager.

The PermissionManager is not thread safe. Lets add some DCHECKs to
let us know when there is an unsafe access.

BUG=658018

R=jochen
==========

to

==========
Add DCHECKs for thread access PermissionManager.

The PermissionManager is not thread safe. Lets add some DCHECKs to
let us know when there is an unsafe access.

BUG=658018

R=jochen

Committed: https://crrev.com/0ebc1f3b8cc7caef42f24aad8bd88fe1f9c3856e
Cr-Commit-Position: refs/heads/master@{#426793}
==========

[commit-bot: I haz the power, 2016-10-21 15:34:03]

Patchset 1 (id:??) landed as
https://crrev.com/0ebc1f3b8cc7caef42f24aad8bd88fe1f9c3856e
Cr-Commit-Position: refs/heads/master@{#426793}