Prerender: Hardcode the Silence experiment date

Prerender: Hardcode the Silence experiment date

As confirmed with the UMA team, the field trial allows only 60-70% coverage of
users for one day (particularly, on Windows).

To address this shortcoming, this change hardcodes the explicit date of the
experiment (for December 14th as seen in PST, to be synchronized with field
trial server-seeding better). To be effective this must be cherry-picked to M55.

The experiment still has the ability to serve as a "kill switch" by setting the
group "ExperimentYes_expires_2016-12-14T07:00:00Z" (or any earlier date in the
string). As discussed above, this has limited effect in the day range.

Also this changes AGSA to opt out of the experiment. Currently AGSA only uses
ORIGIN_EXTERNAL_REQUEST_FORCED_CELLULAR. The experiment will not take effect
on these origins. Other 1st party apps are not using this prerender::Origin, as
far as we know, and the use of it is restricted to 1st party, hence this change
should not affect the experiment for other Android apps.

BUG=640592
Committed: https://crrev.com/40296583e81a52db397a24b2745f43a35ab6870e
Cr-Commit-Position: refs/heads/master@{#435610}

[pasko, 2016-11-29 13:11:18]

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

[commit-bot: I haz the power, 2016-11-29 13:11:32]

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

[pasko, 2016-11-29 13:13:47]

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

[commit-bot: I haz the power, 2016-11-29 13:14:06]

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

[pasko, 2016-11-29 13:14:21]

Description was changed from

==========
Prerender: Hardcode the Silence experiment date

As confirmed with the UMA team today, the field trial allows only 60-70%
coverage of users for one day (particularly, on Windows).

To address this shortcoming, this change hardcodes the explicit date of the
experiment (for December 14th as seen in PST, to be synchronized with field
trial server-seeding better). To be effective this must be cherry-picked to M55.

The experiment still has the ability to serve as a "kill switch" by setting the
group "ExperimentYes_expires_2016-12-14T07:00:00Z" (or any earlier date in the
string). As discussed above, this has limited effect in the day range.

BUG=640592
==========

to

==========
Prerender: Hardcode the Silence experiment date

As confirmed with the UMA team today, the field trial allows only 60-70%
coverage of users for one day (particularly, on Windows).

To address this shortcoming, this change hardcodes the explicit date of the
experiment (for December 14th as seen in PST, to be synchronized with field
trial server-seeding better). To be effective this must be cherry-picked to M55.

The experiment still has the ability to serve as a "kill switch" by setting the
group "ExperimentYes_expires_2016-12-14T07:00:00Z" (or any earlier date in the
string). As discussed above, this has limited effect in the day range.

BUG=640592
==========

[pasko, 2016-11-29 13:14:21]

pasko@chromium.org changed reviewers:
+ droger@chromium.org, mattcary@chromium.org

[commit-bot: I haz the power, 2016-11-29 13:57:16]

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

[commit-bot: I haz the power, 2016-11-29 13:57:17]

Dry run: This issue passed the CQ dry run.

[mattcary, 2016-11-29 23:02:40]

lgtm

[pasko, 2016-12-01 13:13:01]

Description was changed from

==========
Prerender: Hardcode the Silence experiment date

As confirmed with the UMA team today, the field trial allows only 60-70%
coverage of users for one day (particularly, on Windows).

To address this shortcoming, this change hardcodes the explicit date of the
experiment (for December 14th as seen in PST, to be synchronized with field
trial server-seeding better). To be effective this must be cherry-picked to M55.

The experiment still has the ability to serve as a "kill switch" by setting the
group "ExperimentYes_expires_2016-12-14T07:00:00Z" (or any earlier date in the
string). As discussed above, this has limited effect in the day range.

BUG=640592
==========

to

==========
Prerender: Hardcode the Silence experiment date

As confirmed with the UMA team, the field trial allows only 60-70% coverage of
users for one day (particularly, on Windows).

To address this shortcoming, this change hardcodes the explicit date of the
experiment (for December 14th as seen in PST, to be synchronized with field
trial server-seeding better). To be effective this must be cherry-picked to M55.

The experiment still has the ability to serve as a "kill switch" by setting the
group "ExperimentYes_expires_2016-12-14T07:00:00Z" (or any earlier date in the
string). As discussed above, this has limited effect in the day range.

Also this changes AGSA to opt out of the experiment. Currently AGSA only uses
ORIGIN_EXTERNAL_REQUEST_FORCED_CELLULAR. The experiment will not take effect
on these origins. Other 1st party apps are not using this prerender::Origin, as
far as we know, and the use of it is restricted to 1st party, hence this change
should not affect the experiment for other Android apps.

BUG=640592
==========

[pasko, 2016-12-01 13:15:42]

droger: can you please look at it today?

I want to get it approved for a late cherry-pick to M55. Cuncurrently asking for
launch review.

[droger, 2016-12-01 14:06:32]

lgtm

[pasko, 2016-12-01 14:35:32]

The CQ bit was checked by pasko@chromium.org

[pasko, 2016-12-01 14:35:33]

The patchset sent to the CQ was uploaded after l-g-t-m from
mattcary@chromium.org
Link to the patchset: https://codereview.chromium.org/2538723003/#ps40001
(title: "allow ORIGIN_EXTERNAL_REQUEST_FORCED_CELLULAR during PrerenderSilence")

[commit-bot: I haz the power, 2016-12-01 14:35:46]

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, 2016-12-01 15:24:22]

CQ is committing da patch.

Bot data: {"patchset_id": 40001, "attempt_start_ts": 1480602932793570,
"parent_rev": "c74e4593f4adf008145c751179f47a805d6a93e7", "commit_rev":
"92b9e138b9492d778aa3dd00b90c5513b5f60006"}

[commit-bot: I haz the power, 2016-12-01 15:24:49]

Committed patchset #3 (id:40001)

[commit-bot: I haz the power, 2016-12-01 15:28:49]

Description was changed from

==========
Prerender: Hardcode the Silence experiment date

As confirmed with the UMA team, the field trial allows only 60-70% coverage of
users for one day (particularly, on Windows).

To address this shortcoming, this change hardcodes the explicit date of the
experiment (for December 14th as seen in PST, to be synchronized with field
trial server-seeding better). To be effective this must be cherry-picked to M55.

The experiment still has the ability to serve as a "kill switch" by setting the
group "ExperimentYes_expires_2016-12-14T07:00:00Z" (or any earlier date in the
string). As discussed above, this has limited effect in the day range.

Also this changes AGSA to opt out of the experiment. Currently AGSA only uses
ORIGIN_EXTERNAL_REQUEST_FORCED_CELLULAR. The experiment will not take effect
on these origins. Other 1st party apps are not using this prerender::Origin, as
far as we know, and the use of it is restricted to 1st party, hence this change
should not affect the experiment for other Android apps.

BUG=640592
==========

to

==========
Prerender: Hardcode the Silence experiment date

As confirmed with the UMA team, the field trial allows only 60-70% coverage of
users for one day (particularly, on Windows).

To address this shortcoming, this change hardcodes the explicit date of the
experiment (for December 14th as seen in PST, to be synchronized with field
trial server-seeding better). To be effective this must be cherry-picked to M55.

The experiment still has the ability to serve as a "kill switch" by setting the
group "ExperimentYes_expires_2016-12-14T07:00:00Z" (or any earlier date in the
string). As discussed above, this has limited effect in the day range.

Also this changes AGSA to opt out of the experiment. Currently AGSA only uses
ORIGIN_EXTERNAL_REQUEST_FORCED_CELLULAR. The experiment will not take effect
on these origins. Other 1st party apps are not using this prerender::Origin, as
far as we know, and the use of it is restricted to 1st party, hence this change
should not affect the experiment for other Android apps.

BUG=640592

Committed: https://crrev.com/40296583e81a52db397a24b2745f43a35ab6870e
Cr-Commit-Position: refs/heads/master@{#435610}
==========

[commit-bot: I haz the power, 2016-12-01 15:28:50]

Patchset 3 (id:??) landed as
https://crrev.com/40296583e81a52db397a24b2745f43a35ab6870e
Cr-Commit-Position: refs/heads/master@{#435610}

[pasko, 2016-12-02 19:10:00]

A revert of this CL (patchset #3 id:40001) has been created in
https://codereview.chromium.org/2546153002/ by pasko@chromium.org.

The reason for reverting is: too late to get it into M55.