Add ignoreDepthValues to XRWebGLLayer.

Exposing that attribute and ignoring it is technically spec compliant, but we plan on using the value in a later change.

Bug: 939618
Change-Id: I414688f1e956777299245067dfdf858062b89f61
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1521815
Commit-Queue: Jacob DeWitt <jacde@chromium.org>
Reviewed-by: Klaus Weidner <klausw@chromium.org>
Reviewed-by: Brandon Jones <bajones@chromium.org>
Reviewed-by: Bill Orr <billorr@chromium.org>
Cr-Commit-Position: refs/heads/master@{#643062}
6 files changed