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Along the change, fixed a bug where primary user is in background.

BUG=672829
TEST=Ran on DUT. Ran trybot.

Change-Id: I83c080fd005bb55cb1c1570f6ab465ad6524a2aa
Reviewed-on: https://chromium-review.googlesource.com/563151
Commit-Queue: Hidehiko Abe <hidehiko@chromium.org>
Reviewed-by: Yusuke Sato <yusukes@chromium.org>
Reviewed-by: Yuki Awano <yawano@chromium.org>
Cr-Commit-Position: refs/heads/master@{#485247}