[iOS] Starting the new implementation of the sign-in UI

Adding SigninCoordinator class for the new implementation of sign-in
UI.
Based on design: http://go/chrome-ios-signin-migration
Related to:
 + crrev.com/c/2025353
 + crrev.com/c/2027809

Bug: 971989
Change-Id: Ib9e07a05cb843a7335bb79b5cf576d7b00e91970
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2025547
Commit-Queue: Jérôme Lebel <jlebel@chromium.org>
Reviewed-by: Gauthier Ambard <gambard@chromium.org>
Cr-Commit-Position: refs/heads/master@{#736440}

ios/chrome/browser/ui/authentication/signin/BUILD.gn

+# Copyright 2020 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.
+
+import("//build/config/chrome_build.gni")
+
+source_set("signin") {
+  configs += [ "//build/config/compiler:enable_arc" ]
+  sources = [ "signin_coordinator.h" ]
+  public_deps = [
+    "//base",
+    "//components/signin/public/base",
+    "//ios/chrome/browser/ui/coordinators:chrome_coordinators",
+  ]
+}
+
+source_set("private") {
+  configs += [ "//build/config/compiler:enable_arc" ]
+  sources = [ "signin_coordinator.mm" ]
+  deps = [ ":signin" ]
+}

ios/chrome/browser/ui/authentication/signin/signin_coordinator.h

+// Copyright 2020 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_BROWSER_UI_AUTHENTICATION_SIGNIN_SIGNIN_COORDINATOR_H_
+#define IOS_CHROME_BROWSER_UI_AUTHENTICATION_SIGNIN_SIGNIN_COORDINATOR_H_
+
+#import <UIKit/UIKit.h>
+
+#import "base/ios/block_types.h"
+#import "components/signin/public/base/signin_metrics.h"
+#import "ios/chrome/browser/ui/coordinators/chrome_coordinator.h"
+
+class Browser;
+@class ChromeIdentity;
+
+@protocol ApplicationCommands;
+@protocol BrowsingDataCommands;
+@protocol SyncPresenter;
+
+// Sign-in result returned Sign-in result.
+typedef NS_ENUM(NSUInteger, SigninCoordinatorResult) {
+  // Sign-in has been canceled by the user or by another reason.
+  SigninCoordinatorResultCanceledByUser,
+  // Sign-in has been done, but the user didn’t accept nor refuse to sync.
+  SigninCoordinatorResultInterrupted,
+  // Sign-in has been done, the user has been explicitly accepted or refused
+  // sync.
+  SigninCoordinatorResultSuccess,
+};
+
+// Action to do when the sign-in dialog needs to be interrupted.
+typedef NS_ENUM(NSUInteger, SigninCoordinatorInterruptAction) {
+  // Stops the sign-in coordinator without dismissing the view.
+  SigninCoordinatorInterruptActionNoDismiss,
+  // Stops the sign-in coordinator and dismisses the view without animation.
+  SigninCoordinatorInterruptActionDismissWithoutAnimation,
+  // Stops the sign-in coordinator and dismisses the view with animation.
+  SigninCoordinatorInterruptActionDismissWithAnimation,
+};
+
+// Called when the sign-in dialog is closed.
+// |result| is the sign-in result state.
+// |identity| is the identity chosen by the user during the sign-in.
+typedef void (^SigninCoordinatorCompletionCallback)(
+    SigninCoordinatorResult signinResult,
+    ChromeIdentity* identity);
+
+// Main class for sign-in coordinator. This class should not be instantiated
+// directly, this should be done using the class methods.
+@interface SigninCoordinator : ChromeCoordinator
+
+// Dispatcher.
+@property(nonatomic, strong, readonly)
+    id<ApplicationCommands, BrowsingDataCommands>
+        dispatcher;
+
+// Called when the sign-in dialog is interrupted, canceled or successful.
+@property(nonatomic, copy) SigninCoordinatorCompletionCallback signinCompletion;
+
+// Returns a coordinator for user sign-in workflow.
+// |viewController| presents the sign-in.
+// |identity| is the identity preselected with the sign-in opens.
+// |accessPoint| is the view where the sign-in button was displayed.
+// |promoAction| is promo button used to trigger the sign-in.
++ (instancetype)
+    userSigninCoordinatorWithBaseViewController:
+        (UIViewController*)viewController
+                                        browser:(Browser*)browser
+                                       identity:(ChromeIdentity*)identity
+                                    accessPoint:
+                                        (signin_metrics::AccessPoint)accessPoint
+                                    promoAction:(signin_metrics::PromoAction)
+                                                    promoAction;
+
+// Returns a coordinator for first run sign-in workflow.
+// |viewController| presents the sign-in.
+// |presenter| to present sync-related UI.
++ (instancetype)
+    firstRunCoordinatorWithBaseViewController:(UIViewController*)viewController
+                                      browser:(Browser*)browser
+                                syncPresenter:(id<SyncPresenter>)presenter;
+
+// Returns a coordinator for upgrade sign-in workflow.
+// |viewController| presents the sign-in.
++ (instancetype)upgradeSigninPromoCoordinatorWithBaseViewController:
+                    (UIViewController*)viewController
+                                                            browser:(Browser*)
+                                                                        browser;
+
+// Returns a coordinator for advanced sign-in settings workflow.
+// |viewController| presents the sign-in.
++ (instancetype)
+    advancedSettingsSigninCoordinatorWithBaseViewController:
+        (UIViewController*)viewController
+                                                    browser:(Browser*)browser;
+
+// Returns a coordinator to add an account.
+// |viewController| presents the sign-in.
+// |accessPoint| access point from the sign-in where is started.
++ (instancetype)
+    addAccountCoordinatorWithBaseViewController:
+        (UIViewController*)viewController
+                                        browser:(Browser*)browser
+                                    accessPoint:(signin_metrics::AccessPoint)
+                                                    accessPoint;
+
+// Returns a coordinator for re-authentication workflow.
+// |viewController| presents the sign-in.
+// |accessPoint| access point from the sign-in where is started.
+// |promoAction| is promo button used to trigger the sign-in.
++ (instancetype)
+    reAuthenticationCoordinatorWithBaseViewController:
+        (UIViewController*)viewController
+                                              browser:(Browser*)browser
+                                          accessPoint:
+                                              (signin_metrics::AccessPoint)
+                                                  accessPoint
+                                          promoAction:
+                                              (signin_metrics::PromoAction)
+                                                  promoAction;
+
+// Interrupts the sign-in flow.
+// |action| action describing how to interrupt the sign-in.
+// |completion| called once the sign-in is fully interrupted.
+- (void)interruptWithAction:(SigninCoordinatorInterruptAction)action
+                 completion:(ProceduralBlock)completion;
+
+@end
+
+#endif  // IOS_CHROME_BROWSER_UI_AUTHENTICATION_SIGNIN_SIGNIN_COORDINATOR_H_

ios/chrome/browser/ui/authentication/signin/signin_coordinator.mm

+// Copyright 2020 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.
+
+#include "ios/chrome/browser/ui/authentication/signin/signin_coordinator.h"
+
+#if !defined(__has_feature) || !__has_feature(objc_arc)
+#error "This file requires ARC support."
+#endif
+
+using signin_metrics::AccessPoint;
+using signin_metrics::PromoAction;
+
+@implementation SigninCoordinator
+
++ (instancetype)
+    userSigninCoordinatorWithBaseViewController:
+        (UIViewController*)viewController
+                                        browser:(Browser*)browser
+                                       identity:(ChromeIdentity*)identity
+                                    accessPoint:(AccessPoint)accessPoint
+                                    promoAction:(PromoAction)promoAction {
+  // TODO(crbug.com/971989): Needs implementation.
+  NOTIMPLEMENTED();
+  return nil;
+}
+
++ (instancetype)
+    firstRunCoordinatorWithBaseViewController:(UIViewController*)viewController
+                                      browser:(Browser*)browser
+                                syncPresenter:(id<SyncPresenter>)syncPresenter {
+  // TODO(crbug.com/971989): Needs implementation.
+  NOTIMPLEMENTED();
+  return nil;
+}
+
++ (instancetype)
+    upgradeSigninPromoCoordinatorWithBaseViewController:
+        (UIViewController*)viewController
+                                                browser:(Browser*)browser {
+  // TODO(crbug.com/971989): Needs implementation.
+  NOTIMPLEMENTED();
+  return nil;
+}
+
++ (instancetype)
+    advancedSettingsSigninCoordinatorWithBaseViewController:
+        (UIViewController*)viewController
+                                                    browser:(Browser*)browser {
+  // TODO(crbug.com/971989): Needs implementation.
+  NOTIMPLEMENTED();
+  return nil;
+}
+
++ (instancetype)addAccountCoordinatorWithBaseViewController:
+                    (UIViewController*)viewController
+                                                    browser:(Browser*)browser
+                                                accessPoint:
+                                                    (AccessPoint)accessPoint {
+  // TODO(crbug.com/971989): Needs implementation.
+  NOTIMPLEMENTED();
+  return nil;
+}
+
++ (instancetype)
+    reAuthenticationCoordinatorWithBaseViewController:
+        (UIViewController*)viewController
+                                              browser:(Browser*)browser
+
+                                          accessPoint:(AccessPoint)accessPoint
+                                          promoAction:(PromoAction)promoAction {
+  // TODO(crbug.com/971989): Needs implementation.
+  NOTIMPLEMENTED();
+  return nil;
+}
+
+- (void)interruptWithAction:(SigninCoordinatorInterruptAction)action
+                 completion:(ProceduralBlock)completion {
+  // This method needs to be implemented in the subclass.
+  NOTREACHED();
+}
+
+@end

ios/chrome/browser/ui/signin_interaction/BUILD.gn

@@ -21,6 +21,7 @@ source_set("signin_interaction") {
     "//ios/chrome/browser/signin",
     "//ios/chrome/browser/ui/alert_coordinator",
     "//ios/chrome/browser/ui/authentication",
+    "//ios/chrome/browser/ui/authentication/signin",
     "//ios/chrome/browser/ui/commands",
     "//ios/chrome/browser/ui/coordinators:chrome_coordinators",
     "//ios/public/provider/chrome/browser",