Upstream Chrome on iOS source code [1/11].

ios/chrome/app/application_delegate/app_navigation.h

+// 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.
+
+#ifndef IOS_CHROME_APP_APPLICATION_DELEGATE_APP_NAVIGATION_H_
+#define IOS_CHROME_APP_APPLICATION_DELEGATE_APP_NAVIGATION_H_
+
+#import <Foundation/Foundation.h>
+
+#include "base/ios/block_types.h"
+
+namespace ios {
+class ChromeBrowserState;
+}  // namespace ios
+
+@class SettingsNavigationController;
+
+// Handles the navigation through the application.
+@protocol AppNavigation<NSObject>
+
+// Navigation View controller for the settings.
+@property(nonatomic, retain)
+    SettingsNavigationController* settingsNavigationController;
+
+// Presents a SignedInAccountsViewController for |browserState| on the top view
+// controller.
+- (void)presentSignedInAccountsViewControllerForBrowserState:
+    (ios::ChromeBrowserState*)browserState;
+
+// Closes the settings UI with or without animation, with an optional
+// completion block.
+- (void)closeSettingsAnimated:(BOOL)animated
+                   completion:(ProceduralBlock)completion;
+
+@end
+
+#endif  // IOS_CHROME_APP_APPLICATION_DELEGATE_APP_NAVIGATION_H_