Allow vibrate in cross-origin iframes with user gesture.

Allow vibrate in cross-origin iframes with user gesture.

This is to fix the issue of breaking some use cases of vibrate in
cross-origin iframes. Once the iframe has ever received a user gesture,
it will be allowed to call vibrate.

See more context:
https://github.com/WICG/interventions/issues/25

BUG=683938
Review-Url: https://codereview.chromium.org/2642263006
Cr-Commit-Position: refs/heads/master@{#445631}
(cherry picked from commit 8f4a5209d0e6306060e901f89f345517e0df6219)

Review-Url: https://codereview.chromium.org/2654133003 .
Cr-Commit-Position: refs/branch-heads/2987@{#95}
Cr-Branched-From: ad51088c0e8776e8dcd963dbe752c4035ba6dab6-refs/heads/master@{#444943}
Committed: https://chromium.googlesource.com/chromium/src/+/ca1fbefb12a1ac5ef98a739e9659a8e0c1e976ba

[Rick Byers, 2017-01-25 21:14:34]

Description was changed from

==========
Allow vibrate in cross-origin iframes with user gesture.

This is to fix the issue of breaking some use cases of vibrate in
cross-origin iframes. Once the iframe has ever received a user gesture,
it will be allowed to call vibrate.

See more context:
https://github.com/WICG/interventions/issues/25

BUG=683938

Review-Url: https://codereview.chromium.org/2642263006
Cr-Commit-Position: refs/heads/master@{#445631}
(cherry picked from commit 8f4a5209d0e6306060e901f89f345517e0df6219)
==========

to

==========
Allow vibrate in cross-origin iframes with user gesture.

This is to fix the issue of breaking some use cases of vibrate in
cross-origin iframes. Once the iframe has ever received a user gesture,
it will be allowed to call vibrate.

See more context:
https://github.com/WICG/interventions/issues/25

BUG=683938

Review-Url: https://codereview.chromium.org/2642263006
Cr-Commit-Position: refs/heads/master@{#445631}
(cherry picked from commit 8f4a5209d0e6306060e901f89f345517e0df6219)

Review-Url: https://codereview.chromium.org/2654133003 .
Cr-Commit-Position: refs/branch-heads/2987@{#95}
Cr-Branched-From:
ad51088c0e8776e8dcd963dbe752c4035ba6dab6-refs/heads/master@{#444943}
Committed:
https://chromium.googlesource.com/chromium/src/+/ca1fbefb12a1ac5ef98a739e9659...
==========

[Rick Byers, 2017-01-25 21:14:35]

Committed patchset #1 (id:1) manually as
ca1fbefb12a1ac5ef98a739e9659a8e0c1e976ba.