Relax same-origin policy for ServiceWorker openWindow() in Blink.

Relax same-origin policy for ServiceWorker openWindow() in Blink.

This is the Blink patch following the Chromium change:
https://codereview.chromium.org/980383004

This CL also include the tests.

BUG=457187
Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=191649

[mlamouri (slow - plz ping), 2015-03-06 15:46:57]

mlamouri@chromium.org changed reviewers:
+ jochen@chromium.org, michaeln@chromium.org, mkwst@chromium.org,
tsepez@chromium.org

[mlamouri (slow - plz ping), 2015-03-06 15:46:58]

Same as https://codereview.chromium.org/980383004

mkwst@, jochen@ and tsepez@ please have a look at the security implications.

michaeln@, could you do an OWNER review?

Thanks :)

[Mike West, 2015-03-06 15:59:53]

LGTM.

[jochen (gone - plz use gerrit), 2015-03-09 15:30:34]

lgtm

[Tom Sepez, 2015-03-09 16:59:12]

lgtm

[mlamouri (slow - plz ping), 2015-03-09 20:01:08]

The CQ bit was checked by mlamouri@chromium.org

[commit-bot: I haz the power, 2015-03-09 20:01:51]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/985043002/1

[commit-bot: I haz the power, 2015-03-10 04:26:27]

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

[commit-bot: I haz the power, 2015-03-10 04:26:29]

Try jobs failed on following builders:
  linux_blink_rel on tryserver.blink (JOB_FAILED,
http://build.chromium.org/p/tryserver.blink/builders/linux_blink_rel/builds/5...)

[mlamouri (slow - plz ping), 2015-03-10 13:26:46]

The CQ bit was checked by mlamouri@chromium.org

[mlamouri (slow - plz ping), 2015-03-10 13:26:46]

The patchset sent to the CQ was uploaded after l-g-t-m from jochen@chromium.org,
mkwst@chromium.org, tsepez@chromium.org
Link to the patchset: https://codereview.chromium.org/985043002/#ps20001 (title:
"rebase")

[commit-bot: I haz the power, 2015-03-10 13:27:43]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/985043002/20001

[commit-bot: I haz the power, 2015-03-10 18:48:50]

Committed patchset #2 (id:20001) as
https://src.chromium.org/viewvc/blink?view=rev&revision=191649