Make WebGL jasmine tests run consistently across machines

[etpinard]

More info in #240 and specifically in #240 (comment)

[etpinard]

Making our gl jasmine test work on CircleCI is getting more and more critical.

I'll give it a shot this at some point this week. I'm hoping that using xvfb in a similar way to this project will get us close.

[etpinard]

• https://groups.google.com/a/chromium.org/forum/#!topic/chromium-discuss/NpsDdbtSRsU
• http://stackoverflow.com/a/13779193/4068492

might be of interest.

So maybe using Chromium + karma on CircleCI with a few extra flags would work.

[etpinard]

As per issues

• Support Xvfb in launcher karma-runner/karma#1320
• New Launcher - Chrome Headless karma-runner/karma#2489

a karma-based solution should be made possible in the not-so-far future.

[etpinard]

I think I'm on to something here

https://gist.github.com/etpinard/f328c38536360ff37c0de62172c01617

This thing

https://github.com/CodeYellowBV/run-headless-chromium

might be exactly what we need.

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WebGL jasmine tests on CI by week's end? Maybe ... see the run-headless-chromium branch.