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Add Phone Hub, Phone Hub Notifications, Phone Hub Notifications
Badge and Phone Hub Task continuation feature item summaries to
Multi Device sub page.

Bug: 1106937
Change-Id: Ib1b99e6d1187220eceb365e97b1177c15f1cad24
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2386420Reviewed-by: Kyle Horimoto <khorimoto@chromium.org>
Commit-Queue: Claude van der Merwe <cvandermerwe@google.com>
Cr-Commit-Position: refs/heads/master@{#803467}