[CRD iOS] Branching internal and external implementations

remoting/ios/app/app_delegate.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/app_delegate.h"
 
 #include "base/logging.h"
 #include "ui/base/l10n/l10n_util.h"
 #include "ui/base/resource/resource_bundle.h"
 
+#import "remoting/ios/app/app_view_controller.h"
 #import "remoting/ios/app/remoting_view_controller.h"
 #import "remoting/ios/facade/remoting_authentication.h"
 #import "remoting/ios/facade/remoting_service.h"
 
+@interface AppDelegate () {
+  AppViewController* _appViewController;
+}
+@end
+
 @implementation AppDelegate
 
 @synthesize window = _window;
 
 - (BOOL)application:(UIApplication*)application
     willFinishLaunchingWithOptions:(NSDictionary*)launchOptions {
   self.window =
       [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
   self.window.backgroundColor = [UIColor whiteColor];
   return YES;
@@ skipping 17 matching lines @@
   }
   NSString* authorizationCode = [components objectForKey:@"code"];
 
   [[RemotingService SharedInstance].authentication
       authenticateWithAuthorizationCode:authorizationCode];
 
   [self launchRemotingViewController];
   return YES;
 }
 
+#pragma mark - Public
+- (void)setMenuVisible:(BOOL)visible animated:(BOOL)animated {
+  DCHECK(_appViewController != nil);
+  [_appViewController setMenuVisible:visible animated:animated];
+}
+
+- (void)requestSignIn {
+  DCHECK(_appViewController != nil);
+  [_appViewController requestSignIn];
+}
+
+#pragma mark - Properties
+
++ (AppDelegate*)instance {
+  return (AppDelegate*)UIApplication.sharedApplication.delegate;
+}
+
+#pragma mark - Private
+
 - (void)launchRemotingViewController {
   RemotingViewController* vc = [[RemotingViewController alloc] init];
   UINavigationController* navController =
       [[UINavigationController alloc] initWithRootViewController:vc];
   navController.navigationBarHidden = true;
-  self.window.rootViewController = navController;
+
+  _appViewController = [[AppViewController alloc] init];
+  _appViewController.mainViewController = navController;
+  self.window.rootViewController = _appViewController;
   [self.window makeKeyAndVisible];
 }
 
 @end