WebGLRenderer: Accesible properties. See #7483.

src/renderers/WebGLRenderer.js

@@ -263,6 +263,7 @@ THREE.WebGLRenderer = function ( parameters ) {
 	this.context = _gl;
 	this.capabilities = capabilities;
 	this.extensions = extensions;
+	this.properties = properties;
 	this.state = state;
 
 	// shadow map