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This is UI side code to handle buttons in assistant notification.

Bug: b/117295934
Test: manual.
Change-Id: I61144f418ba7af127c09892707ba442e8c5f5e65
Reviewed-on: https://chromium-review.googlesource.com/c/1274826
Commit-Queue: Tao Wu <wutao@chromium.org>
Reviewed-by: Sam McNally <sammc@chromium.org>
Reviewed-by: Xiaohui Chen <xiaohuic@chromium.org>
Cr-Commit-Position: refs/heads/master@{#600129}