The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/455a29452a85a4de9603b0d4d99373930cb20bb3

commit 455a29452a85a4de9603b0d4d99373930cb20bb3
Author: klausw <klausw@chromium.org>
Date: Tue Jun 20 20:44:40 2017

WebVR: fix angular velocity calculation for headset

The refactor https://chromium-review.googlesource.com/536475 lost a pair of
parentheses, so the division by epsilon_seconds was just dividing one of the
matrix elements instead of the difference. This broke angular velocity
calculation.

BUG= 735155 

Review-Url: https://codereview.chromium.org/2947843003
Cr-Commit-Position: refs/heads/master@{#480946}

[modify] https://crrev.com/455a29452a85a4de9603b0d4d99373930cb20bb3/device/vr/android/gvr/gvr_delegate.cc

Latency patch works again with this fix.