not support ANGLE_instanced_arrays extension

[yyc-git]

Hello!
I'm implementing instance tech in my engine, but I find that the WebGL-Inspector doesn't support instance(when I open the WebGL-inspector chrome extension in chrome, the code "gl.getExtension("ANGLE_instanced_arrays")" just return null).

This is a really handy and useful tool, but it's better to support the extension! Thanks a lot!