[CRD iOS] Branching internal and external implementations

remoting/ios/app/app_view_controller_chromium.mm

+// Copyright 2017 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_view_controller.h"
+
+#include "base/logging.h"
+
+#import "remoting/ios/app/remoting_menu_view_controller.h"
+
+// The Chromium implementation for the AppViewController. It simply shows the
+// menu modally.
+@interface AppViewController () {
+  UIViewController* _mainViewController;
+
+  RemotingMenuViewController* _menuController;  // nullable
+}
+@end
+
+@implementation AppViewController
+
+- (instancetype)initWithMainViewController:
+    (UIViewController*)mainViewController {
+  if (self = [super init]) {
+    _mainViewController = mainViewController;
+  }
+  return self;
+}
+
+- (void)viewDidLoad {
+  [self addChildViewController:_mainViewController];
+  [self.view addSubview:_mainViewController.view];
+  [_mainViewController didMoveToParentViewController:self];
+}
+
+#pragma mark - AppController
+- (void)showMenuAnimated:(BOOL)animated {
+  if (_menuController != nil && [_menuController isBeingPresented]) {
+    return;
+  }
+  _menuController = [[RemotingMenuViewController alloc] init];
+  [self presentViewController:_menuController animated:animated completion:nil];
+}
+
+- (void)hideMenuAnimated:(BOOL)animated {
+  if (_menuController == nil || ![_menuController isBeingPresented]) {
+    return;
+  }
+  [_menuController dismissViewControllerAnimated:animated completion:nil];
+  _menuController = nil;
+}
+
+- (void)presentSignInFlow {
+  [self showMenuAnimated:YES];
+}
+
+- (UIViewController*)childViewControllerForStatusBarStyle {
+  return _mainViewController;
+}
+
+- (UIViewController*)childViewControllerForStatusBarHidden {
+  return _mainViewController;
+}
+
+@end