Add constructor to XRRay, use XRRay in requestHitTest API

Rename transform_matrix to matrix.


Bug: 871824,922172
Change-Id: Iaea7441bad00977b8a48424b3cbd428b184d4b13
Reviewed-on: https://chromium-review.googlesource.com/c/1435217
Commit-Queue: Piotr Bialecki <bialpio@chromium.org>
Reviewed-by: Brandon Jones <bajones@chromium.org>
Reviewed-by: David Dorwin <ddorwin@chromium.org>
Reviewed-by: Bill Orr <billorr@chromium.org>
Reviewed-by: Brian Sheedy <bsheedy@chromium.org>
Cr-Commit-Position: refs/heads/master@{#632470}
28 files changed