Add an ONC property for proactive key caching.

Add an ONC property for proactive key caching with documentation.

BUG=472741
TEST=None

Committed: https://crrev.com/b605e72e1b07f9b7501882c31ec422d05c1794bf
Cr-Commit-Position: refs/heads/master@{#326738}

[Matthew Wein, 2015-04-13 22:00:49]

mattwein@chromium.org changed reviewers:
+ pstew@chromium.org

[Matthew Wein, 2015-04-16 17:25:52]

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

[Matthew Wein, 2015-04-16 17:25:54]

The CQ bit was unchecked by mattwein@chromium.org

[Matthew Wein, 2015-04-16 20:50:40]

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

[commit-bot: I haz the power, 2015-04-16 20:52:20]

Dry run: CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1085703002/40001

[commit-bot: I haz the power, 2015-04-16 20:52:22]

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

[commit-bot: I haz the power, 2015-04-16 20:52:22]

Dry run: No LGTM from a valid reviewer yet. Only full committers are accepted.
Even if an LGTM may have been provided, it was from a non-committer,
_not_ a full super star committer.
See http://www.chromium.org/getting-involved/become-a-committer
Note that this has nothing to do with OWNERS files.

[Matthew Wein, 2015-04-16 20:53:16]

The CQ bit was unchecked by mattwein@chromium.org

[Matthew Wein, 2015-04-16 20:53:25]

mattwein@chromium.org changed reviewers:
- pstew@chromium.org

[Matthew Wein, 2015-04-20 19:01:21]

Patchset #3 (id:40001) has been deleted

[Matthew Wein, 2015-04-20 19:01:54]

Patchset #2 (id:20001) has been deleted

[Matthew Wein, 2015-04-21 20:21:31]

mattwein@chromium.org changed reviewers:
+ pstew@chromium.org, stevenjb@chromium.org

[Paul Stewart, 2015-04-21 20:21:51]

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

[Paul Stewart, 2015-04-21 20:22:56]

The CQ bit was unchecked by pstew@chromium.org

[stevenjb, 2015-04-24 03:15:58]

stevenjb@chromium.org changed reviewers:
+ pneubeck@chromium.org

[stevenjb, 2015-04-24 03:15:59]

+pneubeck@ FYI
lgtm

[Matthew Wein, 2015-04-24 03:22:17]

The CQ bit was checked by mattwein@chromium.org

[commit-bot: I haz the power, 2015-04-24 03:22:37]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1085703002/60001

[commit-bot: I haz the power, 2015-04-24 04:16:05]

Committed patchset #2 (id:60001)

[commit-bot: I haz the power, 2015-04-24 04:17:02]

Patchset 2 (id:??) landed as
https://crrev.com/b605e72e1b07f9b7501882c31ec422d05c1794bf
Cr-Commit-Position: refs/heads/master@{#326738}

[pneubeck (no reviews), 2015-04-24 07:21:32]

the bug number seems to be wrong

[Matthew Wein, 2015-04-24 17:44:09]

Fixed associated bug number.