Chrome Version: 67.0.3396.55
OS: Android N
Device: Nexus 6P

What steps will reproduce the problem?
(1) enable WebXR flags
(2) Go to https://immersive-web.github.io/webxr-samples/positional-audio.html
(3) Press enter VR button to enter Cardboard mode
(4) Hit play button to start audio playback

What is the expected result? Audio playback is successful

What happens instead? Sound is distorted and significantly slowed down