Klaus, looks like this was https://chromium-review.googlesource.com/c/chromium/src/+/903542

Please fix or revert ASAP.

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/35b411e684c853a1483bd9064e245b04edfb8059

commit 35b411e684c853a1483bd9064e245b04edfb8059
Author: Klaus Weidner <klausw@chromium.org>
Date: Tue Feb 06 19:48:08 2018

Fix VR browsing pose

My fix for the slightly-wrong poses in WebVR unfortunately resulted in
completely wrong (uninitialized) poses for VR browsing mode. Sorry
about that. Use a mode-appropriate pose, and add comments.

BUG= 809608 , 808147 

Change-Id: I2193fd6dfd6d2093b18c16b35680338a64bec5fe
Reviewed-on: https://chromium-review.googlesource.com/905101
Reviewed-by: Michael Thiessen <mthiesse@chromium.org>
Commit-Queue: Klaus Weidner <klausw@chromium.org>
Cr-Commit-Position: refs/heads/master@{#534758}
[modify] https://crrev.com/35b411e684c853a1483bd9064e245b04edfb8059/chrome/browser/android/vr_shell/vr_shell_gl.cc