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This change implements the input related portions of the webxr-test-api
and updates internal tests to use those methods/constants/inits.
Most of the logic is ported from xr-internal-device-mocking.js and just
converted from attributes to a pair of set/clear properties.  No tests
were actually using the getters, so those were just deleted.  Because
the webxr-test-api does not yet support gamepads, all of that logic was
left in the internal mock.

It also forces/fixes a potential bug where a device with no inputs may
opt to set the "InputStates" value of the mojom to null rather than an
empty array. (The device code typically sets this to an empty array)

Rather than risk losing/confusing the diff to the updated tests, future
work will move these tests to the external WPTs

Bug: 979318
Change-Id: I846831a561217abd66ab841326a5e5472f38afeb
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1699505Reviewed-by: Bill Orr <billorr@chromium.org>
Commit-Queue: Alexander Cooper <alcooper@chromium.org>
Cr-Commit-Position: refs/heads/master@{#677061}