Corridor artifacts on the ipad

Reported here: https://groups.google.com/forum/?hl=en#!topic/cesium-dev/x02lygB7hYc

Seen with Chrome 59.0.3071.102. iOS version: 10.3.2. Perhaps a driver issue?


Start with the linked Google Groups report and attached image, then try to reproduce the corridor artifacts in Chrome 59 on iOS 10.3.2. No file, test, or entry point is named, so the first task is locating the corridor rendering path and determining whether the issue is reproducible or driver-specific. Done means isolating the cause or documenting the reproduction result.

Written by the indexing model from the issue text.