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

ios/chrome/app/application_delegate/browser_launcher.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_BROWSER_LAUNCHER_H_
+#define IOS_CHROME_APP_APPLICATION_DELEGATE_BROWSER_LAUNCHER_H_
+
+#import "ios/chrome/browser/ui/main/browser_view_information.h"
+
+// Possible stages of the browser initialization. These states will be reached
+// in sequence, each stage is a requiremant for the following one.
+enum BrowserInitializationStageType {
+  // This state is before any initialization in MainController.
+  INITIALIZATION_STAGE_NONE = 0,
+  // Initialization state after |didFinishLaunchingWithOptions|.
+  INITIALIZATION_STAGE_BASIC,
+  // Initialization state needed by background handlers.
+  INITIALIZATION_STAGE_BACKGROUND,
+  // Full initialization of the browser.
+  INITIALIZATION_STAGE_FOREGROUND,
+  BROWSER_INITIALIZATION_STAGE_TYPE_COUNT,
+};
+
+// This protocol defines the startup method for the application.
+@protocol BrowserLauncher<NSObject>
+
+// Cached launchOptions from AppState's -didFinishLaunchingWithOptions.
+@property(nonatomic, retain) NSDictionary* launchOptions;
+
+// Highest initialization stage reached by the browser.
+@property(nonatomic, readonly)
+    BrowserInitializationStageType browserInitializationStage;
+
+// Browser view information created during startup.
+@property(nonatomic, readonly) id<BrowserViewInformation>
+    browserViewInformation;
+
+// Initializes the application up to |stage|.
+- (void)startUpBrowserToStage:(BrowserInitializationStageType)stage;
+
+@end
+
+#endif  // IOS_CHROME_APP_APPLICATION_DELEGATE_BROWSER_LAUNCHER_H_