Add THREE.MouseUtils with BUTTONS enum

examples/js/controls/OrbitControls.js

@@ -23,9 +23,6 @@
 
 THREE.OrbitControls = function ( object, domElement ) {
 
-	// MouseEvent.button codes per https://developer.mozilla.org/en-US/docs/Web/API/MouseEvent.button
-	var MOUSEBUTTONS = { LEFT: 0, MIDDLE: 1, RIGHT: 2 };
-
 	this.object = object;
 	this.domElement = ( domElement !== undefined ) ? domElement : document;
 
@@ -74,7 +71,7 @@ THREE.OrbitControls = function ( object, domElement ) {
 	this.keys = { LEFT: 37, UP: 38, RIGHT: 39, BOTTOM: 40 };
 
 	// Mouse buttons
-	this.mouseButtons = { ORBIT: MOUSEBUTTONS.LEFT, ZOOM: MOUSEBUTTONS.MIDDLE, PAN: MOUSEBUTTONS.RIGHT };
+	this.mouseButtons = { ORBIT: THREE.MouseUtils.BUTTONS.LEFT, ZOOM: THREE.MouseUtils.BUTTONS.MIDDLE, PAN: THREE.MouseUtils.BUTTONS.RIGHT };
 
 	////////////
 	// internals

src/extras/MouseUtils.js

+/**
+ * @author yangchristian
+ */
+
+THREE.MouseUtils = {
+	// MouseEvent.button codes per https://developer.mozilla.org/en-US/docs/Web/API/MouseEvent.button
+	BUTTONS: { LEFT: 0, MIDDLE: 1, RIGHT: 2 }
+};
\ No newline at end of file

utils/build/includes/extras.json

 [
 	"src/extras/GeometryUtils.js",
 	"src/extras/ImageUtils.js",
+	"src/extras/MouseUtils.js",
 	"src/extras/SceneUtils.js",
 	"src/extras/FontUtils.js",
 	"src/extras/core/Curve.js",