Walk up frame tree for srcdoc referrer policies

Walk up frame tree for srcdoc referrer policies

When deciding the referrer policy for a srcdoc document, walk up the
frame tree until we find a non-srcdoc document OR a srcdoc document with
its own policy set via a meta element.

This implements the algorithm defined in
https://html.spec.whatwg.org/multipage/browsers.html#set-up-a-browsing-context-environment-settings-object. However,
the spec'ed algorithm has to be adjusted per
https://github.com/whatwg/html/pull/1559#issuecomment-251767893 to
account for meta elements in srcdoc documents (which this CL
implements).

BUG=653034, 637007
Committed: https://crrev.com/618cf68c2fc06d58857f4bd44a26737fbe9a2494
Cr-Commit-Position: refs/heads/master@{#423538}

[estark, 2016-10-06 12:32:56]

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

[commit-bot: I haz the power, 2016-10-06 12:33:05]

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

[estark, 2016-10-06 12:45:47]

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

[commit-bot: I haz the power, 2016-10-06 12:45:52]

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

[estark, 2016-10-06 12:47:25]

estark@chromium.org changed reviewers:
+ jochen@chromium.org

[estark, 2016-10-06 12:47:25]

jochen: another referrer policy bug fix for you, PTAL

[jochen (gone - plz use gerrit), 2016-10-06 12:52:31]

lgtm

[commit-bot: I haz the power, 2016-10-06 14:11:42]

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

[commit-bot: I haz the power, 2016-10-06 14:11:42]

Dry run: This issue passed the CQ dry run.

[estark, 2016-10-06 15:17:13]

The CQ bit was checked by estark@chromium.org

[commit-bot: I haz the power, 2016-10-06 15:17:31]

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, 2016-10-06 15:23:42]

Committed patchset #2 (id:20001)

[commit-bot: I haz the power, 2016-10-06 15:27:00]

Description was changed from

==========
Walk up frame tree for srcdoc referrer policies

When deciding the referrer policy for a srcdoc document, walk up the
frame tree until we find a non-srcdoc document OR a srcdoc document with
its own policy set via a meta element.

This implements the algorithm defined in
https://html.spec.whatwg.org/multipage/browsers.html#set-up-a-browsing-contex....
However,
the spec'ed algorithm has to be adjusted per
https://github.com/whatwg/html/pull/1559#issuecomment-251767893 to
account for meta elements in srcdoc documents (which this CL
implements).

BUG=653034,637007
==========

to

==========
Walk up frame tree for srcdoc referrer policies

When deciding the referrer policy for a srcdoc document, walk up the
frame tree until we find a non-srcdoc document OR a srcdoc document with
its own policy set via a meta element.

This implements the algorithm defined in
https://html.spec.whatwg.org/multipage/browsers.html#set-up-a-browsing-contex....
However,
the spec'ed algorithm has to be adjusted per
https://github.com/whatwg/html/pull/1559#issuecomment-251767893 to
account for meta elements in srcdoc documents (which this CL
implements).

BUG=653034,637007

Committed: https://crrev.com/618cf68c2fc06d58857f4bd44a26737fbe9a2494
Cr-Commit-Position: refs/heads/master@{#423538}
==========

[commit-bot: I haz the power, 2016-10-06 15:27:01]

Patchset 2 (id:??) landed as
https://crrev.com/618cf68c2fc06d58857f4bd44a26737fbe9a2494
Cr-Commit-Position: refs/heads/master@{#423538}