The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/3150789a49a47adba3ca3e625b67b5a2cbd3d282

commit 3150789a49a47adba3ca3e625b67b5a2cbd3d282
Author: klausw <klausw@chromium.org>
Date: Thu Apr 06 02:28:54 2017

WebVR: add angular velocity estimate to pose

The WebVR spec supports angular velocity as an optional field. We're not
currently supplying that, but we need the data for motion-to-photon latency
testing.

See also https://github.com/w3c/webvr/issues/212 for a spec clarification
request. Currently, this is returning sensor-relative velocity, may need
to be transformed to a static reference frame.

BUG= 705084 

Review-Url: https://codereview.chromium.org/2770353002
Cr-Commit-Position: refs/heads/master@{#462331}

[modify] https://crrev.com/3150789a49a47adba3ca3e625b67b5a2cbd3d282/chrome/browser/android/vr_shell/non_presenting_gvr_delegate.cc
[modify] https://crrev.com/3150789a49a47adba3ca3e625b67b5a2cbd3d282/chrome/browser/android/vr_shell/vr_controller.cc
[modify] https://crrev.com/3150789a49a47adba3ca3e625b67b5a2cbd3d282/chrome/browser/android/vr_shell/vr_shell_gl.cc
[modify] https://crrev.com/3150789a49a47adba3ca3e625b67b5a2cbd3d282/device/vr/android/gvr/gvr_delegate.cc
[modify] https://crrev.com/3150789a49a47adba3ca3e625b67b5a2cbd3d282/device/vr/android/gvr/gvr_delegate.h

Fix is in Canary 59.0.3065.0, using sitting reference frame as resolved in https://github.com/w3c/webvr/issues/212 . Note that this also changes the Daydream controller's angular velocity vector to be in sitting reference frame, and adds the previously missing linear acceleration.