Change the default budget expiration window to 4 days from 10 days.

Change the default budget expiration window to 4 days from 10 days.

The budget system uses a sliding window which is currently 10 days. That
window is used to set the expiration time for new budget and also to
control how much budget an origin can "save up" for future use.

Based on the UMA data on the updated Site Engagement algorithm in M55,
we can narrow that window while still giving sites an incentive not to
overspend budget.

This CL reduces the window from 10 days to 4 days. It also updates the
relevant tests, in a way that will be more flexible going forward.

BUG=617971
Committed: https://crrev.com/6d52fba2161db44cb252088ec54ea0ae3b059072
Cr-Commit-Position: refs/heads/master@{#431971}

[harkness, 2016-11-09 13:25:41]

harkness@chromium.org changed reviewers:
+ peter@chromium.org

[Peter Beverloo, 2016-11-14 22:34:40]

The CQ bit was checked by peter@chromium.org

[Peter Beverloo, 2016-11-14 22:34:40]

lgtm

[commit-bot: I haz the power, 2016-11-14 22:37:18]

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, 2016-11-14 23:35:45]

Committed patchset #2 (id:20001)

[commit-bot: I haz the power, 2016-11-14 23:43:40]

Description was changed from

==========
Change the default budget expiration window to 4 days from 10 days.

The budget system uses a sliding window which is currently 10 days. That
window is used to set the expiration time for new budget and also to
control how much budget an origin can "save up" for future use.

Based on the UMA data on the updated Site Engagement algorithm in M55,
we can narrow that window while still giving sites an incentive not to
overspend budget.

This CL reduces the window from 10 days to 4 days. It also updates the
relevant tests, in a way that will be more flexible going forward.

BUG=617971
==========

to

==========
Change the default budget expiration window to 4 days from 10 days.

The budget system uses a sliding window which is currently 10 days. That
window is used to set the expiration time for new budget and also to
control how much budget an origin can "save up" for future use.

Based on the UMA data on the updated Site Engagement algorithm in M55,
we can narrow that window while still giving sites an incentive not to
overspend budget.

This CL reduces the window from 10 days to 4 days. It also updates the
relevant tests, in a way that will be more flexible going forward.

BUG=617971

Committed: https://crrev.com/6d52fba2161db44cb252088ec54ea0ae3b059072
Cr-Commit-Position: refs/heads/master@{#431971}
==========

[commit-bot: I haz the power, 2016-11-14 23:43:41]

Patchset 2 (id:??) landed as
https://crrev.com/6d52fba2161db44cb252088ec54ea0ae3b059072
Cr-Commit-Position: refs/heads/master@{#431971}