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- Add customized notification view to phone hub notification controller.
- Add "From Phone" to the notification's header.
- Add IDs to NotificationViewMD to access the header in the view.

Screenshot: https://screenshot.googleplex.com/3kW99Ch5wGvVrGz

BUG=1106937,1126208

Change-Id: I0d0726d0d05c967384db702a557ba7a2895d77c3
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2464163
Commit-Queue: Andre Le <leandre@chromium.org>
Reviewed-by: Tim Song <tengs@chromium.org>
Reviewed-by: Kyle Horimoto <khorimoto@chromium.org>
Cr-Commit-Position: refs/heads/master@{#816646}