This horrible violation of Cesium coding standards is a workaround for:

https://code.google.com/p/chromium/issues/detail?id=167394

It can be deleted once Chrome 29 (or maybe 28?) becomes stable.
Merge remote-tracking branch 'origin/master' into explained-NaNs
Merge remote-tracking branch 'origin/master' into explained-NaNs
Merge pull request #933 from emackey/explained-NaNs

Workaround for Chrome 25 to 28