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

ios/chrome/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.
+
+// ======                        New Architecture                         =====
+// =         This code is only used in the new iOS Chrome architecture.       =
+// ============================================================================
+
+#import "ios/chrome/app/app_delegate.h"
+
+#import "ios/chrome/app/application_state.h"
+#import "ios/chrome/app/steps/launch_to_background.h"
+#import "ios/chrome/app/steps/launch_to_basic.h"
+#import "ios/chrome/app/steps/launch_to_foreground.h"
+#import "ios/chrome/app/steps/tab_grid_coordinator+application_step.h"
+
+#if !defined(__has_feature) || !__has_feature(objc_arc)
+#error "This file requires ARC support."
+#endif
+
+@interface AppDelegate ()
+@property(nonatomic, strong) ApplicationState* applicationState;
+@end
+
+@implementation AppDelegate
+
+@synthesize applicationState = _applicationState;
+
+#pragma mark - UIApplicationDelegate (app state changes and system events)
+
+- (BOOL)application:(UIApplication*)application
+    didFinishLaunchingWithOptions:(NSDictionary*)launchOptions {
+  self.applicationState = [[ApplicationState alloc] init];
+  self.applicationState.application = application;
+  [self configureApplicationState];
+
+  [self.applicationState launchWithOptions:launchOptions];
+  return YES;
+}
+
+- (void)applicationDidBecomeActive:(UIApplication*)application {
+}
+
+- (void)applicationWillResignActive:(UIApplication*)application {
+}
+
+- (void)applicationDidEnterBackground:(UIApplication*)application {
+}
+
+- (void)applicationWillEnterForeground:(UIApplication*)application {
+}
+
+- (void)applicationWillTerminate:(UIApplication*)application {
+}
+
+- (void)applicationDidReceiveMemoryWarning:(UIApplication*)application {
+}
+
+#pragma mark - UIApplicationDelegate (background dowloading)
+
+- (void)application:(UIApplication*)application
+    performFetchWithCompletionHandler:
+        (void (^)(UIBackgroundFetchResult))completionHandler {
+}
+
+- (void)application:(UIApplication*)application
+    handleEventsForBackgroundURLSession:(NSString*)identifier
+                      completionHandler:(void (^)())completionHandler {
+}
+
+#pragma mark - UIApplicationDelegate (user activity and quick actions)
+
+- (BOOL)application:(UIApplication*)application
+    willContinueUserActivityWithType:(NSString*)userActivityType {
+  return NO;
+}
+
+- (BOOL)application:(UIApplication*)application
+    continueUserActivity:(NSUserActivity*)userActivity
+      restorationHandler:(void (^)(NSArray*))restorationHandler {
+  return NO;
+}
+
+- (void)application:(UIApplication*)application
+    performActionForShortcutItem:(UIApplicationShortcutItem*)shortcutItem
+               completionHandler:(void (^)(BOOL))completionHandler {
+}
+
+#pragma mark - UIApplicationDelegate (opening URL-specified resources)
+
+- (BOOL)application:(UIApplication*)application
+            openURL:(NSURL*)url
+            options:(NSDictionary<UIApplicationOpenURLOptionsKey, id>*)options {
+  [self.applicationState.URLOpener openURL:url];
+  return YES;
+}
+
+#pragma mark - Private methods
+
+// Configures the application state for application launch by setting the launch
+// steps.
+// Future architecture/refactoring note: configuring the application state in
+// this way is outside the scope of responsibility of the object as defined in
+// the header file. The correct solution is probably a helper object that can
+// perform all of the configuration necessary, and that can be adjusted as
+// needed.
+- (void)configureApplicationState {
+  [self.applicationState.launchSteps addObjectsFromArray:@[
+    [[ProviderInitializer alloc] init],
+    [[SetupBundleAndUserDefaults alloc] init],
+    [[StartChromeMain alloc] init],
+    [[SetBrowserState alloc] init],
+    [[BeginForegrounding alloc] init],
+    [[BrowserStateInitializer alloc] init],
+    [[PrepareForUI alloc] init],
+    [[CompleteForegrounding alloc] init],
+    [[TabGridCoordinator alloc] init],
+  ]];
+}
+
+@end