Uniform: Added clone(). See #10178.

src/core/Uniform.js

@@ -15,4 +15,10 @@ function Uniform( value ) {
 
 }
 
+Uniform.prototype.clone = function () {
+
+	return new Uniform( this.value.clone === undefined ? this.value : this.value.clone() );
+
+};
+
 export { Uniform };