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See go/unified-better-together-cros for an outline of this service.

This CL does the following:
(1) Creates a Mojo interface for the service, adding only a single
    function for now.
(2) Creates the MultiDeviceSetupService and MultiDeviceSetupImpl classes
    which implement this interface, as well as a test for the service.
(3) Registers the service in the browser process via ProfileImpl.
(4) Generates JavaScript files for the interface; because these files
    are the first resources generated in //chromeos, this CL also adds a
    new chromeos_resources.grd.
(5) Adds the new "multidevice_setup" capability to the content_browser
    manifest file so that it can be used by content_renderer.
(6) Adds a new button on the chrome://proximity-auth debug WebUI page
    which makes a Mojo call to the service.

Change-Id: I0b74373b78a1c92fe01d789028342707321c2134
Reviewed-on: https://chromium-review.googlesource.com/954010Reviewed-by: Steven Bennetts <stevenjb@chromium.org>
Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Reviewed-by: agrieve <agrieve@chromium.org>
Reviewed-by: anthonyvd <anthonyvd@chromium.org>
Reviewed-by: Ken Rockot <rockot@chromium.org>
Commit-Queue: Kyle Horimoto <khorimoto@chromium.org>
Cr-Commit-Position: refs/heads/master@{#543894}