Added extension controlled prefs to TestingPrefService

Added extension controlled prefs to TestingPrefService

This CL is extracted from https://codereview.chromium.org/2479113002.
to keep it under manageable size. This changes are helpful to emulate
extension controlled prefs in unit_tests.

R=gab@chromium.org

Review-Url: https://codereview.chromium.org/2615403002
Cr-Commit-Position: refs/heads/master@{#442215}
Committed: https://chromium.googlesource.com/chromium/src/+/658f626bbfc9e31ece0266453246a357a9de3735

[Alexander Yashkin, 2017-01-07 20:27:12]

a-v-y@yandex-team.ru changed reviewers:
+ jochen@chromium.org

[Alexander Yashkin, 2017-01-08 18:19:43]

The CQ bit was checked by a-v-y@yandex-team.ru to run a CQ dry run

[commit-bot: I haz the power, 2017-01-08 18:19:56]

Dry run: CQ is trying da patch. Follow status at
 
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.chromium.or...

[commit-bot: I haz the power, 2017-01-08 18:19:57]

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

[commit-bot: I haz the power, 2017-01-08 18:19:58]

Dry run: No L-G-T-M from a valid reviewer yet. 
CQ run can only be started by full committers or once the patch has
received an L-G-T-M from a full committer.
Even if an L-G-T-M 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.

[jochen (gone - plz use gerrit), 2017-01-09 08:33:07]

lgtm

[Alexander Yashkin, 2017-01-09 08:34:09]

The CQ bit was checked by a-v-y@yandex-team.ru to run a CQ dry run

[commit-bot: I haz the power, 2017-01-09 08:34:19]

Dry run: CQ is trying da patch. Follow status at
 
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.chromium.or...

[commit-bot: I haz the power, 2017-01-09 09:12:16]

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

[commit-bot: I haz the power, 2017-01-09 09:12:17]

Dry run: This issue passed the CQ dry run.

[Alexander Yashkin, 2017-01-09 09:14:50]

The CQ bit was checked by a-v-y@yandex-team.ru

[commit-bot: I haz the power, 2017-01-09 09:15:00]

CQ is trying da patch. Follow status at
 
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.chromium.or...

[commit-bot: I haz the power, 2017-01-09 09:18:50]

CQ is committing da patch.

Bot data: {"patchset_id": 1, "attempt_start_ts": 1483953290717780, "parent_rev":
"1d659157007dc8af77915b4af72f577b324c5e81", "commit_rev":
"658f626bbfc9e31ece0266453246a357a9de3735"}

[commit-bot: I haz the power, 2017-01-09 09:19:18]

Description was changed from

==========
Added extension controlled prefs to TestingPrefService

This CL is extracted from https://codereview.chromium.org/2479113002.
to keep it under manageable size. This changes are helpful to emulate
extension controlled prefs in unit_tests.

R=gab@chromium.org
==========

to

==========
Added extension controlled prefs to TestingPrefService

This CL is extracted from https://codereview.chromium.org/2479113002.
to keep it under manageable size. This changes are helpful to emulate
extension controlled prefs in unit_tests.

R=gab@chromium.org

Review-Url: https://codereview.chromium.org/2615403002
Cr-Commit-Position: refs/heads/master@{#442215}
Committed:
https://chromium.googlesource.com/chromium/src/+/658f626bbfc9e31ece0266453246...
==========

[commit-bot: I haz the power, 2017-01-09 09:19:19]

Committed patchset #1 (id:1) as
https://chromium.googlesource.com/chromium/src/+/658f626bbfc9e31ece0266453246...

[gab, 2017-01-09 17:01:08]

prefs r-s per https://codereview.chromium.org/2479113002