Auto merge of #32 - autrilla:Uniform4, r=emilio
Auto merge of #32 - autrilla:Uniform4, r=emilio

Added Uniform4i

Blocking https://github.com/servo/servo/pull/10369

servo/webrender,servo/webrender,servo/webrender,alanamramjit/webrender,servo/webrender,servo/webrender_traits,DDEFISHER/webrender_traits,servo/webrender,servo/webrender,alanamramjit/webrender