Adds generator support for Xcode 5 xctest targets.

test/mac/xctest/App/Classes/AppDelegate.m

Index: test/mac/xctest/App/Classes/AppDelegate.m
diff --git a/test/mac/xctest/App/Classes/AppDelegate.m b/test/mac/xctest/App/Classes/AppDelegate.m
new file mode 100644
index 0000000000000000000000000000000000000000..d3b148458039808403c987b4f06e2160c5f051d6
--- /dev/null
+++ b/test/mac/xctest/App/Classes/AppDelegate.m
@@ -0,0 +1,14 @@
+// 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 "AppDelegate.h"
+
+@implementation AppDelegate {
+  NSWindow *_window;
+}
+
+- (void)applicationDidFinishLaunching:(NSNotification *)notification {
+  _window = [[NSWindow alloc] init];
+}
+
+@end