GitLab

Added a value to allow a resetpose event to be propogated from GVR out
to the javascript.

Bug: 843184
Change-Id: I5433be4f26af21fa09a35b7485d8c7911a5e89c2
Reviewed-on: https://chromium-review.googlesource.com/1063027Reviewed-by: Will Harris <wfh@chromium.org>
Reviewed-by: Brandon Jones <bajones@chromium.org>
Commit-Queue: Anna Offenwanger <offenwanger@chromium.org>
Cr-Commit-Position: refs/heads/master@{#560871}