Adding <keygen> Content Setting (Android UI)

Adding <keygen> Content Setting (Android UI)

This adds Android UI to allow the user to change the Content Setting to block/allow keygen usage on a per-site basis.

To trigger the exception, we also create a Content Exception on any site that uses a <keygen> element.

BUG=514767
Review URL: https://codereview.chromium.org/1432573002

Cr-Commit-Position: refs/heads/master@{#370416}
(cherry picked from commit 34a7682cd49f8fdfb6a0f715a6118076f9ad8224)

Committed: https://chromium.googlesource.com/chromium/src/+/797002194be4592ededdc0e3c627a1b6eee70326

[davidben, 2016-01-25 18:34:06]

Description was changed from

==========
Adding <keygen> Content Setting (Android UI)

This adds Android UI to allow the user to change the Content Setting to
block/allow keygen usage on a per-site basis.

To trigger the exception, we also create a Content Exception on any site that
uses a <keygen> element.

BUG=514767

Review URL: https://codereview.chromium.org/1432573002

Cr-Commit-Position: refs/heads/master@{#370416}
(cherry picked from commit 34a7682cd49f8fdfb6a0f715a6118076f9ad8224)
==========

to

==========
Adding <keygen> Content Setting (Android UI)

This adds Android UI to allow the user to change the Content Setting to
block/allow keygen usage on a per-site basis.

To trigger the exception, we also create a Content Exception on any site that
uses a <keygen> element.

BUG=514767

Review URL: https://codereview.chromium.org/1432573002

Cr-Commit-Position: refs/heads/master@{#370416}
(cherry picked from commit 34a7682cd49f8fdfb6a0f715a6118076f9ad8224)

Committed:
https://chromium.googlesource.com/chromium/src/+/797002194be4592ededdc0e3c627...
==========

[davidben, 2016-01-25 18:34:08]

Committed patchset #1 (id:1) manually as
797002194be4592ededdc0e3c627a1b6eee70326.