Add CHECKs to help debug crashes exposed by adding a member to IPC::Message::Header.

Add CHECKs to help debug crashes exposed by adding a member to IPC::Message::Header.

This CL checks that the data_offset field of the ResourceMsg_DataReceived has
the appropriate range in both the sender and the receiver of the IPC message.

BUG=527588
Committed: https://crrev.com/01d2c16fa0ae1952af0d5519d134f944f898f70f
Cr-Commit-Position: refs/heads/master@{#350421}

[erikchen, 2015-09-23 18:23:16]

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

[erikchen, 2015-09-23 18:23:17]

avi: Please review.

This will tell us definitely whether anything funky is happening for some users
on Canary. This should have been the first thing I checked.

[Avi (use Gerrit), 2015-09-23 19:38:42]

lgtm

go for it

[erikchen, 2015-09-23 21:41:15]

The CQ bit was checked by erikchen@chromium.org

[commit-bot: I haz the power, 2015-09-23 21:42:39]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1361903004/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1361903004/1

[commit-bot: I haz the power, 2015-09-24 00:50:34]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-09-24 00:51:42]

Patchset 1 (id:??) landed as
https://crrev.com/01d2c16fa0ae1952af0d5519d134f944f898f70f
Cr-Commit-Position: refs/heads/master@{#350421}

[erikchen, 2015-09-25 19:07:03]

A revert of this CL (patchset #1 id:1) has been created in
https://codereview.chromium.org/1365963007/ by erikchen@chromium.org.

The reason for reverting is: Crashes have been exposed. This CL is no longer
needed..