[wrapper-tracing] XMLHttpRequest: Add write barriers

[wrapper-tracing] XMLHttpRequest: Add write barriers

BUG=chromium:468240
R=haraken@chromium.org,hlopko@chromium.org

Committed: https://crrev.com/a0225aa6c5ae0c4019abf578db12ffa1e1f3ee25
Cr-Commit-Position: refs/heads/master@{#428005}

[Michael Lippautz, 2016-10-27 10:06:16]

Another fix.

[Michael Lippautz, 2016-10-27 10:06:20]

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

[commit-bot: I haz the power, 2016-10-27 10:06:42]

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

[haraken, 2016-10-27 10:17:46]

LGTM

Instead of relying on the trace-wrapper verifiler, we might want to seriously
consider writing a GC plugin that verifies the following fact:

- A member is traced by traceWrappers() iff. the member is TraceWrapperMember
(except a couple of cases where we want to manually add write barriers)

You can just reuse the GC plugin for Oilpan.

[commit-bot: I haz the power, 2016-10-27 12:22:09]

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

[commit-bot: I haz the power, 2016-10-27 12:22:10]

Dry run: This issue passed the CQ dry run.

[Michael Lippautz, 2016-10-27 12:26:30]

The CQ bit was checked by mlippautz@chromium.org

[commit-bot: I haz the power, 2016-10-27 12:26:51]

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, 2016-10-27 12:32:35]

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

[commit-bot: I haz the power, 2016-10-27 12:32:37]

Failed to apply the patch.
On branch working_branch
Your branch is up-to-date with 'origin/refs/pending/heads/master'.
nothing to commit, working tree clean

[commit-bot: I haz the power, 2016-10-27 12:35:34]

Description was changed from

==========
[wrapper-tracing] XMLHttpRequest: Add write barriers

BUG=chromium:468240
R=haraken@chromium.org,hlopko@chromium.org
==========

to

==========
[wrapper-tracing] XMLHttpRequest: Add write barriers

BUG=chromium:468240
R=haraken@chromium.org,hlopko@chromium.org

Committed: https://crrev.com/a0225aa6c5ae0c4019abf578db12ffa1e1f3ee25
Cr-Commit-Position: refs/heads/master@{#428005}
==========

[commit-bot: I haz the power, 2016-10-27 12:35:35]

Patchset 1 (id:??) landed as
https://crrev.com/a0225aa6c5ae0c4019abf578db12ffa1e1f3ee25
Cr-Commit-Position: refs/heads/master@{#428005}