Introduce accuracyMode for GeolocationPosition

This CL introduces the accuracyMode attribute when the ApproximateGeolocationPermission feature is enabled.

Bug: 394756106
Change-Id: I404480ed513f6447f610dafae4d5df441b5470d5
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/7511640
Reviewed-by: Antonio Sartori <antoniosartori@chromium.org>
Reviewed-by: Alvin Ji <alvinji@chromium.org>
Reviewed-by: Colin Blundell <blundell@chromium.org>
Reviewed-by: Dave Tapuska <dtapuska@chromium.org>
Commit-Queue: Tom Van Goethem <tov@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1579479}
NOKEYCHECK=True
GitOrigin-RevId: 4bf5b4edc431dab46dea9dcc2dc09a8ccd396b68