Widget: Add a _delay method. Will be used in various places to replace setTimeout with custom binding (mostly getting rid of var self/that)

tests/unit/widget/widget_core.js

@@ -1040,4 +1040,28 @@ test( "redefine", function() {
 	equal( $.ui.testWidget.foo, "bar", "static properties remain" );
 });
 
+asyncTest( "_delay", function() {
+	expect( 4 );
+	var order = 0,
+		that;
+	$.widget( "ui.testWidget", {
+		defaultElement: null,
+		_create: function() {
+			that = this;
+			this._delay(function() {
+				strictEqual( this, that );
+				equal( order, 1 );
+				start();
+			}, 500);
+			this._delay("callback");
+		},
+		callback: function() {
+			strictEqual( this, that );
+			equal( order, 0 );
+			order += 1;
+		}
+	});
+	$( "#widget" ).testWidget();
+});
+
 }( jQuery ) );

ui/jquery.ui.widget.js

@@ -333,6 +333,15 @@ $.Widget.prototype = {
 		});
 	},
 
+	_delay: function( handler, delay ) {
+		function handlerProxy() {
+			return ( typeof handler === "string" ? instance[ handler ] : handler )
+				.apply( instance, arguments );
+		}
+		var instance = this;
+		setTimeout( handlerProxy, delay || 0 );
+	},
+
 	_hoverable: function( element ) {
 		this.hoverable = this.hoverable.add( element );
 		this._bind( element, {