It's using Google Closure Library (and compiler).
GWT generates code with a $gwt_version
variable (and other functions and variables with gwt
in their name), and that's not the case here.
Looking for "goog" in the code of the Body Browser, you'll find a mention of goog.structs.SimplePool
which is a Closure Library class: http://closure-library.googlecode.com/svn/docs/class_goog_structs_SimplePool.html
I don't know of any framework around WebGL (apart for things like ForPlay which totally abstractize it, so the same code can run in WebGL or canvas —or actually a plain JVM or even Flash as ActionScript—, but that's something entirely different, and GWT-based as far as ForPlay is concerned)