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... according to the comment from the UX deck: https://docs.google.com/presentation/d/1MWWejK-y2vnBN3Wg__Kd_LIiAcIF3VctzMowMI3wM4w/edit?disco=AAAAKz06f_U

For each VM, there are actually 3 types of notifications: "camera
(only)", "mic (only)", and "camera and mic". We have two types of tray
items: "camera", and "mic".

The "camera" tray item is displayed when there is a "camera" and/or
"camera and mic" notifications.

The non-trivial part of this cl is that the "camera" tray item now used
a different message depending on whether there is a "camera and mic"
notification or not. To do this, VmCameraMicManager now exposes the
exact type of the notification, and ash will pass this information down
to CameraMicTrayItemView.

Bug: b/167491603
Change-Id: I7acd1aa87d463930406b917da7dfd0ddbacf799b
Fixed: b/177270109
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2622361
Commit-Queue: Jason Lin <lxj@google.com>
Reviewed-by: Daniel Ng <danielng@google.com>
Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#842949}