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This CL is adding a way of experimenting with the location sent with
omnibox requests.
It allows to add experiment with no location, restricted location or
the precise location.
The Feature is checked only on iOS 14 and when the location can be
used to reduce biais in the groups.

Bug: 1165796
Change-Id: I6aa2bf1214c3ecc548a0220c668bbf658a775306
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2624672
Commit-Queue: Gauthier Ambard <gambard@chromium.org>
Reviewed-by: Stepan Khapugin <stkhapugin@chromium.org>
Reviewed-by: Rohit Rao <rohitrao@chromium.org>
Auto-Submit: Gauthier Ambard <gambard@chromium.org>
Cr-Commit-Position: refs/heads/master@{#845587}