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Currently, we extensively use VRPose to surface data to blink even for
the entities where additional VRPose fields make no sense. In addition,
VRPose allows for null position / orientation even though those
entities will always have position and orientation known.

I have decided against using gfx.mojom.Transform to surface that
information since it allows for transforms that perform more than just
translation and rotation and we would have to perform additional checks
to enforce that no additional components are present.

Bug: 1013229
Change-Id: I517a5b33aa905ca3c29e8b742c6767f2b6eb03bd
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1887752
Commit-Queue: Piotr Bialecki <bialpio@chromium.org>
Auto-Submit: Piotr Bialecki <bialpio@chromium.org>
Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Reviewed-by: Alexander Cooper <alcooper@chromium.org>
Cr-Commit-Position: refs/heads/master@{#714288}