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Adds deep links to the Devices page, including the Pointers, Keyboard,
Display, Power, and Stylus subpages. Also adds focus() overrides to
the settings_dropdown_menu and settings_slider to assist with deep
linking.

Bug: 1084154
Change-Id: I8503a7cde63911f050c50a81b3dbba9ceaf0bc4a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2370083
Commit-Queue: Daniel Classon <dclasson@google.com>
Reviewed-by: Kyle Horimoto <khorimoto@chromium.org>
Cr-Commit-Position: refs/heads/master@{#801511}