Adds some DCHECKs to help isolate flake

Adds some DCHECKs to help isolate flake

We seem to be getting messages when a binding is paused. The only way
this should be possible is if an associated interface has been
created. The added DCHECKs check for this.

BUG=626869
TEST=none
R=ben@chromium.org

Committed: https://crrev.com/3383bb96a7ca62b76c9cc6b119474a023465832b
Cr-Commit-Position: refs/heads/master@{#406597}

[sky, 2016-07-20 16:20:25]

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

[commit-bot: I haz the power, 2016-07-20 16:21:01]

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

[Ben Goodger (Google), 2016-07-20 16:46:25]

lgtm

[sky, 2016-07-20 16:48:17]

The CQ bit was unchecked by sky@chromium.org

[sky, 2016-07-20 16:48:22]

The CQ bit was checked by sky@chromium.org

[commit-bot: I haz the power, 2016-07-20 16:48:55]

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, 2016-07-20 17:26:01]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-07-20 17:26:09]

CQ bit was unchecked.

[commit-bot: I haz the power, 2016-07-20 17:27:37]

Description was changed from

==========
Adds some DCHECKs to help isolate flake

We seem to be getting messages when a binding is paused. The only way
this should be possible is if an associated interface has been
created. The added DCHECKs check for this.

BUG=626869
TEST=none
R=ben@chromium.org
==========

to

==========
Adds some DCHECKs to help isolate flake

We seem to be getting messages when a binding is paused. The only way
this should be possible is if an associated interface has been
created. The added DCHECKs check for this.

BUG=626869
TEST=none
R=ben@chromium.org

Committed: https://crrev.com/3383bb96a7ca62b76c9cc6b119474a023465832b
Cr-Commit-Position: refs/heads/master@{#406597}
==========

[commit-bot: I haz the power, 2016-07-20 17:27:38]

Patchset 1 (id:??) landed as
https://crrev.com/3383bb96a7ca62b76c9cc6b119474a023465832b
Cr-Commit-Position: refs/heads/master@{#406597}