Implement instanced WebGL drawing calls (part of #20791)

components/script/dom/webgl_extensions/ext/mod.rs

@@ -5,6 +5,7 @@
 use dom::bindings::codegen::Bindings::WebGLRenderingContextBinding::WebGLRenderingContextConstants as constants;
 use super::{ext_constants, WebGLExtension, WebGLExtensions, WebGLExtensionSpec};
 
+pub mod angleinstancedarrays;
 pub mod extblendminmax;
 pub mod extshadertexturelod;
 pub mod exttexturefilteranisotropic;