Report Login.UsersActiveWeekly.Percent UMA metric.

BUG=chromium:365352
TEST=none

Change-Id: Id1d95d052e32eff438d97685ff6c74d356b19aa4
Reviewed-on: https://chromium-review.googlesource.com/202370
Reviewed-by: Alexander Alekseev <alemate@chromium.org>
Tested-by: Alexander Alekseev <alemate@chromium.org>
Reviewed-by: Bertrand Simonnet <bsimonnet@chromium.org>
Commit-Queue: Alexander Alekseev <alemate@chromium.org>
1 file changed