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Ideally this conversion should happen in the XR service and off the JS
thread, but that's an optimization that can happen later. The actual
conversion may need some tweaking in the future, for things like better
tone mapping, but for the time being this gives a usable result.

Bug: 1147569
Change-Id: I0407eee6e4c8337bd376bd43ca0f32987a471055
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2535915
Commit-Queue: Brandon Jones <bajones@chromium.org>
Reviewed-by: Alexander Cooper <alcooper@chromium.org>
Cr-Commit-Position: refs/heads/master@{#827455}