GitLab

Remove originOffset as a public member of XRReferenceSpace. Add
getOffsetReferenceSpace() method for creating a new XRReferenceSpace
instead of mutating originOffset.

Bug: 958440
Change-Id: I9af336112df7a359a6ac02bd8d30e554ae540511
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1595131
Commit-Queue: Will Cassella <cassew@google.com>
Reviewed-by: Bill Orr <billorr@chromium.org>
Reviewed-by: Brandon Jones <bajones@chromium.org>
Cr-Commit-Position: refs/heads/master@{#659786}