[CRD iOS] Branching internal and external implementations

remoting/ios/app/panel_view_controller_chromium.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/panel_view_controller_chromium.h"
+
+#include "base/logging.h"
+
+#import "remoting/ios/app/remoting_menu_view_controller.h"
+
+@interface PanelViewControllerChromium () {
+  RemotingMenuViewController* _menuController;
+  UIViewController* _mainViewController;
+}
+@end
+
+@implementation PanelViewControllerChromium
+
+- (instancetype)init {
+  if (self = [super init]) {
+    _menuController = [[RemotingMenuViewController alloc] init];
+  }
+  return self;
+}
+
+- (void)setPanelHidden:(BOOL)hidden animated:(BOOL)animated {
+  if (!hidden) {
+    [self presentViewController:_menuController
+                       animated:animated
+                     completion:nil];
+  }
+}
+
+- (void)setMainViewController:(UIViewController*)mainViewController {
+  _mainViewController = mainViewController;
+  [self addChildViewController:_mainViewController];
+  [self.view addSubview:_mainViewController.view];
+  [_mainViewController didMoveToParentViewController:self];
+}
+
+- (UIViewController*)mainViewController {
+  return _mainViewController;
+}
+
+- (UIViewController*)childViewControllerForStatusBarStyle {
+  return _mainViewController;
+}
+
+- (UIViewController*)childViewControllerForStatusBarHidden {
+  return _mainViewController;
+}
+
+@end