Intermittent TIMEOUT in /_webgl/conformance/ogles/GL/swizzlers/swizzlers_113_to_120.html

```
  ▶ TIMEOUT [expected OK] /_webgl/conformance/ogles/GL/swizzlers/swizzlers_113_to_120.html
  │ 
  │ VMware, Inc.
  │ softpipe
  │ 3.3 (Core Profile) Mesa 18.3.0-devel
  │ alloc factor 0.010000 0.900000
  └ alloc factor 0.010000 0.900000
```