commit a250f7e51b640f73b06ad0771e670e4d7e3ca138
author Paul Miller <paulmiller@google.com> Tue Jun 18 23:20:32 2019
committer Commit Bot <commit-bot@chromium.org> Tue Jun 18 23:20:32 2019
tree 5e921f4e9c27ed223dc703fc43991d6edd62bd31
parent 53d2ce28261171598d6ec9f2c1eb4d0fe945b4ba

Support filtering variations studies by country in WebView

Variations studies can have country filters so they only apply to users in
certain countries. WebView must persist these prefs to support this.

Studies configured for "session consistency" can use a different country on
every run. These studies compare their country filter to the current country,
which is stored in kVariationsCountry.

Studies configured for "permanent consistency" will continue using the original
country if the user moves countries. These studies compare their country filter
to all the past countries listed in kVariationsPermanentConsistencyCountry.

See CheckStudyCountry() in study_filtering.cc for how this works.

BUG=823410

Change-Id: I76d6fc3e69a173d8b2de07ea886c215ad91f2f81
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1665468
Reviewed-by: Tao Bai <michaelbai@chromium.org>
Commit-Queue: Paul Miller <paulmiller@chromium.org>
Cr-Commit-Position: refs/heads/master@{#670271}