[CRD iOS] Branching internal and external implementations

remoting/ios/app/remoting_resource_factory_external.mm

+// Copyright 2016 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#if !defined(__has_feature) || !__has_feature(objc_arc)
+#error "This file requires ARC support."
+#endif
+
+#import "remoting/ios/app/remoting_resource_factory_external.h"
+
+#import "remoting/ios/app/remoting_menu_view_controller.h"
+
+@implementation RemotingResourceFactoryExternal
+
+- (UIViewController*)wrapRootViewController:(UIViewController*)controller {
+  // No need to wrap the controller. The external impl will just pop up a modal
+  // menu.
+  return controller;
+}
+
+- (void)presentMenuOnController:(UIViewController*)controller {
+  RemotingMenuViewController* menuViewController =
+      [[RemotingMenuViewController alloc] init];
+  [controller presentViewController:menuViewController
+                           animated:YES
+                         completion:nil];
+}
+
+@end