Add showTrigger to Notification properties.

Bug: 891339
Change-Id: I76dc38e26dd359c656e16910dfb1d317e2f64528
Reviewed-on: https://chromium-review.googlesource.com/c/1470691
Commit-Queue: Richard Knoll <knollr@chromium.org>
Reviewed-by: Yuki Shiino <yukishiino@chromium.org>
Reviewed-by: Kentaro Hara <haraken@chromium.org>
Reviewed-by: Peter Beverloo <peter@chromium.org>
Cr-Commit-Position: refs/heads/master@{#636068}
8 files changed