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In addition to the existing behavior of handling clicks on the 'new
user' notification by opening setup flow, we want clicks on the 'host
switched' and 'chromebook added' notifications to open the settings
subpage. This CL adds a ShowConnectedDevicesSettings to the system tray
mojo service and has those notification clicks call it.

Bug: 876928
Change-Id: I5f49275abb5e24d3973385af5720376de967852b
Reviewed-on: https://chromium-review.googlesource.com/1239113Reviewed-by: James Cook <jamescook@chromium.org>
Reviewed-by: Tom Sepez <tsepez@chromium.org>
Reviewed-by: Kyle Horimoto <khorimoto@chromium.org>
Commit-Queue: Jeremy Klein <jlklein@chromium.org>
Cr-Commit-Position: refs/heads/master@{#593361}