GitLab

Fall back to 3dof-orientation only when tracking is lost. If we
previously were tracking, use the last position.

This doesn't add emulated controller positions - controllers aren't
reported if tracking is lost.

Bug: 944605, 928814
Change-Id: Idc963f66b30905012a7fb6675c07e0d22a382d23
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1545153
Commit-Queue: Bill Orr <billorr@chromium.org>
Reviewed-by: Klaus Weidner <klausw@chromium.org>
Cr-Commit-Position: refs/heads/master@{#646625}