Reland debugging for ipc related crash.

Reland debugging for ipc related crash.

This CL is almost identical to https://codereview.chromium.org/1350823002/. The
only difference is that the part of the CL that causes the crash has been
omitted.

BUG=527588
Committed: https://crrev.com/a7502c6dff276bce3c76d680c5d613cb6ece19be
Cr-Commit-Position: refs/heads/master@{#349828}

[erikchen, 2015-09-18 00:51:54]

erikchen@chromium.org changed reviewers:
+ avi@chromium.org, tsepez@chromium.org

[erikchen, 2015-09-18 00:51:55]

avi, tsepez: Please review.

[Avi (use Gerrit), 2015-09-18 01:51:09]

still lgtm

[Tom Sepez, 2015-09-18 22:42:00]

lgtm

[erikchen, 2015-09-18 23:22:46]

The CQ bit was checked by erikchen@chromium.org

[commit-bot: I haz the power, 2015-09-18 23:23:40]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1354063002/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1354063002/1

[commit-bot: I haz the power, 2015-09-19 00:55:14]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-09-19 00:55:54]

Patchset 1 (id:??) landed as
https://crrev.com/a7502c6dff276bce3c76d680c5d613cb6ece19be
Cr-Commit-Position: refs/heads/master@{#349828}

[erikchen, 2015-09-21 23:37:11]

A revert of this CL (patchset #1 id:1) has been created in
https://codereview.chromium.org/1354863004/ by erikchen@chromium.org.

The reason for reverting is: Supposedly, this CL only changes the signature of
the crash, not the presence of the crash. There is some (but not totally clear)
evidence that this CL is causing a crash itself.

https://code.google.com/p/chromium/issues/detail?id=527588#c32.