Add flags entry to enable Chrome OS component updates fature.

Add flags entry to enable Chrome OS component updates fature.

This adds an entry to about:flags so that users, and internal testers,
can opt into Chrome OS component updates before we roll them out to all
users.

This was originally landed in https://codereview.chromium.org/2544133002,
but reverted in https://codereview.chromium.org/2567773002
because one of the other flags did not work properly.

BUG=670421
Review-Url: https://codereview.chromium.org/2565043002
Cr-Commit-Position: refs/heads/master@{#437774}
(cherry picked from commit 22db7c938623cc9e8b2308a715dd44645dac0a98)

Committed: https://chromium.googlesource.com/chromium/src/+/07db08c0e9cecfe0c08d1d776cd33116b62ae0da

[Greg K, 2016-12-14 23:17:53]

Description was changed from

==========
Add flags entry to enable Chrome OS component updates fature.

This adds an entry to about:flags so that users, and internal testers,
can opt into Chrome OS component updates before we roll them out to all
users.

This was originally landed in https://codereview.chromium.org/2544133002,
but reverted in https://codereview.chromium.org/2567773002
because one of the other flags did not work properly.

BUG=670421

Review-Url: https://codereview.chromium.org/2565043002
Cr-Commit-Position: refs/heads/master@{#437774}
(cherry picked from commit 22db7c938623cc9e8b2308a715dd44645dac0a98)
==========

to

==========
Add flags entry to enable Chrome OS component updates fature.

This adds an entry to about:flags so that users, and internal testers,
can opt into Chrome OS component updates before we roll them out to all
users.

This was originally landed in https://codereview.chromium.org/2544133002,
but reverted in https://codereview.chromium.org/2567773002
because one of the other flags did not work properly.

BUG=670421

Review-Url: https://codereview.chromium.org/2565043002
Cr-Commit-Position: refs/heads/master@{#437774}
(cherry picked from commit 22db7c938623cc9e8b2308a715dd44645dac0a98)

Committed:
https://chromium.googlesource.com/chromium/src/+/07db08c0e9cecfe0c08d1d776cd3...
==========

[Greg K, 2016-12-14 23:17:54]

Committed patchset #1 (id:1) manually as
07db08c0e9cecfe0c08d1d776cd33116b62ae0da.