Adds support for a new target spec: 'mac_xcuitest_bundle'. This allows us to create UI testing bund…

test/mac/xcuitest/MyAppDelegate.m

+// Copyright (c) 2013 Google Inc. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#import "MyAppDelegate.h"
+
+
+@implementation MyAppDelegate
+@synthesize window;
+
+- (BOOL)application:(UIApplication *)application 
+    didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
+  self.window = [[UIWindow alloc] init];
+  self.window.rootViewController = [[UIViewController alloc] init];
+  [self.window makeKeyAndVisible];
+  return YES;
+}
+
+@end