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If the only features requested for an XRSession can be fully supported
by a sensorless session, then just create the sensorless session rather
than trying to get a fully device backed session.  There were cases
where the only requested features were "viewer", but the session was
still being backed by the orientation_sensors device.

This change introduces an enum that indicates whether sensor data, and
therefore a runtime, is needed, optional, or not required. If sensor
data is not required, then a sensorless session is created rather than
querying for device support.

This also refactors "CanRequestSensorlessInlineSession" to an enum, to
better consolidate and support this expanded logic.

Fixed: 1018794
Change-Id: I0b930a733ccab85275fcc965969a17313cb3cf9e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1884827
Commit-Queue: Alexander Cooper <alcooper@chromium.org>
Reviewed-by: Klaus Weidner <klausw@chromium.org>
Cr-Commit-Position: refs/heads/master@{#710608}