Moving emscripten_webgl_* out of library_html5.js?

[waywardmonkeys]

I'm looking at using some of the emscripten_webgl_* calls in IMVU code ... but it imposes a pretty large size hit due to the JSEvents stuff.

All of the functions apart from emscripten_set_webglcontextlost_callback and emscripten_set_webglcontextrestored_callback could readily be moved to a separate library_webgl.js, except for the usage of JSEvents.findEventTarget in emscripten_webgl_create_context ... which could be duplicated or moved to some where else?

[kripken]

Fine with me. @juj?

[juj]

Duplicating JSEvents.findEventTarget for the purposes of performing dead code elimination does not sound good. The proper fix is to restructure library_html5.js to use the xxx_deps syntax more to allow breaking up the code there so that unused bits of JSEvents can be dead code eliminated. I can work on this.

[waywardmonkeys]

For IMVU, I ended up just creating a custom imvugl library as I needed some other stuff as well ... so while I suggested this, I don't actually need it any longer.