Upstream Chrome on iOS source code [7/11].

ios/chrome/browser/ui/settings/accounts_collection_view_controller.mm

Index: ios/chrome/browser/ui/settings/accounts_collection_view_controller.mm
diff --git a/ios/chrome/browser/ui/settings/accounts_collection_view_controller.mm b/ios/chrome/browser/ui/settings/accounts_collection_view_controller.mm
new file mode 100644
index 0000000000000000000000000000000000000000..a3e52cb4dc4ac163a39a33167702f669760f78e6
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+++ b/ios/chrome/browser/ui/settings/accounts_collection_view_controller.mm
@@ -0,0 +1,677 @@
+// Copyright 2015 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 "ios/chrome/browser/ui/settings/accounts_collection_view_controller.h"
+
+#import "base/ios/weak_nsobject.h"
+#import "base/mac/foundation_util.h"
+#include "base/mac/scoped_nsobject.h"
+#include "base/metrics/user_metrics.h"
+#include "base/strings/sys_string_conversions.h"
+#include "base/strings/utf_string_conversions.h"
+#include "components/browser_sync/profile_sync_service.h"
+#include "components/signin/core/browser/account_tracker_service.h"
+#include "components/signin/core/browser/profile_oauth2_token_service.h"
+#include "components/signin/core/browser/signin_manager.h"
+#include "components/signin/ios/browser/oauth2_token_service_observer_bridge.h"
+#include "components/strings/grit/components_strings.h"
+#import "ios/chrome/browser/browser_state/chrome_browser_state.h"
+#include "ios/chrome/browser/signin/account_tracker_service_factory.h"
+#import "ios/chrome/browser/signin/authentication_service.h"
+#import "ios/chrome/browser/signin/authentication_service_factory.h"
+#include "ios/chrome/browser/signin/chrome_identity_service_observer_bridge.h"
+#include "ios/chrome/browser/signin/oauth2_token_service_factory.h"
+#include "ios/chrome/browser/signin/signin_manager_factory.h"
+#include "ios/chrome/browser/sync/ios_chrome_profile_sync_service_factory.h"
+#include "ios/chrome/browser/sync/sync_observer_bridge.h"
+#include "ios/chrome/browser/sync/sync_setup_service.h"
+#include "ios/chrome/browser/sync/sync_setup_service_factory.h"
+#import "ios/chrome/browser/ui/alert_coordinator/alert_coordinator.h"
+#import "ios/chrome/browser/ui/authentication/signin_interaction_controller.h"
+#import "ios/chrome/browser/ui/collection_view/cells/MDCCollectionViewCell+Chrome.h"
+#import "ios/chrome/browser/ui/collection_view/cells/collection_view_account_item.h"
+#import "ios/chrome/browser/ui/collection_view/cells/collection_view_text_item.h"
+#import "ios/chrome/browser/ui/collection_view/collection_view_model.h"
+#import "ios/chrome/browser/ui/colors/MDCPalette+CrAdditions.h"
+#import "ios/chrome/browser/ui/commands/UIKit+ChromeExecuteCommand.h"
+#import "ios/chrome/browser/ui/commands/generic_chrome_command.h"
+#include "ios/chrome/browser/ui/commands/ios_command_ids.h"
+#import "ios/chrome/browser/ui/commands/open_url_command.h"
+#import "ios/chrome/browser/ui/icons/chrome_icon.h"
+#import "ios/chrome/browser/ui/settings/cells/account_control_item.h"
+#import "ios/chrome/browser/ui/settings/settings_navigation_controller.h"
+#import "ios/chrome/browser/ui/settings/sync_settings_collection_view_controller.h"
+#import "ios/chrome/browser/ui/settings/utils/resized_avatar_cache.h"
+#import "ios/chrome/browser/ui/sync/sync_util.h"
+#include "ios/chrome/grit/ios_chromium_strings.h"
+#include "ios/chrome/grit/ios_strings.h"
+#include "ios/public/provider/chrome/browser/chrome_browser_provider.h"
+#include "ios/public/provider/chrome/browser/images/branded_image_provider.h"
+#import "ios/public/provider/chrome/browser/signin/chrome_identity.h"
+#import "ios/public/provider/chrome/browser/signin/chrome_identity_browser_opener.h"
+#import "ios/public/provider/chrome/browser/signin/chrome_identity_service.h"
+#import "net/base/mac/url_conversions.h"
+#include "ui/base/l10n/l10n_util_mac.h"
+
+NSString* const kSettingsAccountsId = @"kSettingsAccountsId";
+NSString* const kSettingsHeaderId = @"kSettingsHeaderId";
+NSString* const kSettingsAccountsSignoutCellId =
+    @"kSettingsAccountsSignoutCellId";
+NSString* const kSettingsAccountsSyncCellId = @"kSettingsAccountsSyncCellId";
+
+namespace {
+
+typedef NS_ENUM(NSInteger, SectionIdentifier) {
+  SectionIdentifierAccounts = kSectionIdentifierEnumZero,
+  SectionIdentifierSync,
+  SectionIdentifierSignOut,
+};
+
+typedef NS_ENUM(NSInteger, ItemType) {
+  ItemTypeAccount = kItemTypeEnumZero,
+  ItemTypeAddAccount,
+  ItemTypeSync,
+  ItemTypeGoogleActivityControls,
+  ItemTypeSignOut,
+  ItemTypeHeader,
+};
+
+}  // namespace
+
+@interface AccountsCollectionViewController ()<
+    ChromeIdentityServiceObserver,
+    ChromeIdentityBrowserOpener,
+    OAuth2TokenServiceObserverBridgeDelegate,
+    SyncObserverModelBridge> {
+  ios::ChromeBrowserState* _browserState;  // weak
+  BOOL _closeSettingsOnAddAccount;
+  std::unique_ptr<SyncObserverBridge> _syncObserver;
+  std::unique_ptr<OAuth2TokenServiceObserverBridge> _tokenServiceObserver;
+  base::scoped_nsobject<SigninInteractionController>
+      _signinInteractionController;
+  // Modal alert for sign out.
+  base::scoped_nsobject<AlertCoordinator> _alertCoordinator;
+  // Whether an authentication operation is in progress (e.g switch accounts,
+  // sign out).
+  BOOL _authenticationOperationInProgress;
+  // Whether the view controller is currently being dismissed and new dismiss
+  // requests should be ignored.
+  BOOL _isBeingDismissed;
+  base::WeakNSObject<UIViewController> _settingsDetails;
+  base::scoped_nsobject<ResizedAvatarCache> _avatarCache;
+  std::unique_ptr<ChromeIdentityServiceObserverBridge> _identityServiceObserver;
+
+  // Enable lookup of item corresponding to a given identity GAIA ID string.
+  base::scoped_nsobject<NSDictionary<NSString*, CollectionViewItem*>>
+      _identityMap;
+}
+
+// Stops observing browser state services. This is required during the shutdown
+// phase to avoid observing services for a browser state that is being killed.
+- (void)stopBrowserStateServiceObservers;
+
+@end
+
+@implementation AccountsCollectionViewController
+
+- (instancetype)initWithBrowserState:(ios::ChromeBrowserState*)browserState
+           closeSettingsOnAddAccount:(BOOL)closeSettingsOnAddAccount {
+  DCHECK(browserState);
+  DCHECK(!browserState->IsOffTheRecord());
+  self = [super initWithStyle:CollectionViewControllerStyleAppBar];
+  if (self) {
+    _browserState = browserState;
+    _closeSettingsOnAddAccount = closeSettingsOnAddAccount;
+    browser_sync::ProfileSyncService* syncService =
+        IOSChromeProfileSyncServiceFactory::GetForBrowserState(_browserState);
+    _syncObserver.reset(new SyncObserverBridge(self, syncService));
+    _tokenServiceObserver.reset(new OAuth2TokenServiceObserverBridge(
+        OAuth2TokenServiceFactory::GetForBrowserState(_browserState), self));
+    [[NSNotificationCenter defaultCenter]
+        addObserver:self
+           selector:@selector(willStartSwitchAccount)
+               name:kSwitchAccountWillStartNotification
+             object:nil];
+    [[NSNotificationCenter defaultCenter]
+        addObserver:self
+           selector:@selector(didFinishSwitchAccount)
+               name:kSwitchAccountDidFinishNotification
+             object:nil];
+    self.collectionViewAccessibilityIdentifier = kSettingsAccountsId;
+    _avatarCache.reset([[ResizedAvatarCache alloc] init]);
+    _identityServiceObserver.reset(
+        new ChromeIdentityServiceObserverBridge(self));
+    [self loadModel];
+  }
+
+  return self;
+}
+
+- (void)dealloc {
+  [[NSNotificationCenter defaultCenter] removeObserver:self];
+  [super dealloc];
+}
+
+- (void)stopBrowserStateServiceObservers {
+  _tokenServiceObserver.reset();
+  _syncObserver.reset();
+}
+
+#pragma mark - SettingsControllerProtocol
+
+- (void)settingsWillBeDismissed {
+  [_signinInteractionController cancel];
+  [_alertCoordinator stop];
+  [self stopBrowserStateServiceObservers];
+}
+
+#pragma mark - SettingsRootCollectionViewController
+
+- (void)reloadData {
+  if (![self authService]->IsAuthenticated()) {
+    // This accounts collection view will be popped or dismissed when the user
+    // is signed out. Avoid reloading it in that case as that would lead to an
+    // empty collection view.
+    return;
+  }
+  [super reloadData];
+}
+
+- (void)loadModel {
+  // Update the title with the name with the currently signed-in account.
+  ChromeIdentity* authenticatedIdentity =
+      [self authService]->GetAuthenticatedIdentity();
+  NSString* title = nil;
+  if (authenticatedIdentity) {
+    title = [authenticatedIdentity userFullName];
+    if (!title) {
+      // TODO(crbug.com/656994): Figure how to handle unnamed account.
+      title = @"Unnamed account";
+    }
+  }
+  self.title = title;
+
+  [super loadModel];
+
+  if (![self authService]->IsAuthenticated())
+    return;
+
+  CollectionViewModel* model = self.collectionViewModel;
+
+  NSMutableDictionary<NSString*, CollectionViewItem*>* mutableIdentityMap =
+      [[[NSMutableDictionary alloc] init] autorelease];
+
+  // Account cells.
+  ProfileOAuth2TokenService* oauth2_service =
+      OAuth2TokenServiceFactory::GetForBrowserState(_browserState);
+  AccountTrackerService* accountTracker =
+      ios::AccountTrackerServiceFactory::GetForBrowserState(_browserState);
+  [model addSectionWithIdentifier:SectionIdentifierAccounts];
+  [model setHeader:[self header]
+      forSectionWithIdentifier:SectionIdentifierAccounts];
+  for (const std::string& account_id : oauth2_service->GetAccounts()) {
+    AccountInfo account = accountTracker->GetAccountInfo(account_id);
+    ChromeIdentity* identity = ios::GetChromeBrowserProvider()
+                                   ->GetChromeIdentityService()
+                                   ->GetIdentityWithGaiaID(account.gaia);
+    CollectionViewItem* item = [self accountItem:identity];
+    [model addItem:item toSectionWithIdentifier:SectionIdentifierAccounts];
+
+    [mutableIdentityMap setObject:item forKey:identity.gaiaID];
+  }
+  _identityMap.reset([mutableIdentityMap retain]);
+
+  [model addItem:[self addAccountItem]
+      toSectionWithIdentifier:SectionIdentifierAccounts];
+
+  // Sync and Google Activity section.
+  [model addSectionWithIdentifier:SectionIdentifierSync];
+  [model addItem:[self syncItem] toSectionWithIdentifier:SectionIdentifierSync];
+  [model addItem:[self googleActivityControlsItem]
+      toSectionWithIdentifier:SectionIdentifierSync];
+
+  // Sign out section.
+  [model addSectionWithIdentifier:SectionIdentifierSignOut];
+  [model addItem:[self signOutItem]
+      toSectionWithIdentifier:SectionIdentifierSignOut];
+}
+
+#pragma mark - Model objects
+
+- (CollectionViewItem*)header {
+  CollectionViewTextItem* header = [
+      [[CollectionViewTextItem alloc] initWithType:ItemTypeHeader] autorelease];
+  header.text = l10n_util::GetNSString(IDS_IOS_OPTIONS_ACCOUNTS_DESCRIPTION);
+  header.accessibilityIdentifier = kSettingsHeaderId;
+  return header;
+}
+
+- (CollectionViewItem*)accountItem:(ChromeIdentity*)identity {
+  CollectionViewAccountItem* item = [[[CollectionViewAccountItem alloc]
+      initWithType:ItemTypeAccount] autorelease];
+  [self updateAccountItem:item withIdentity:identity];
+  return item;
+}
+
+- (void)updateAccountItem:(CollectionViewAccountItem*)item
+             withIdentity:(ChromeIdentity*)identity {
+  item.image = [_avatarCache resizedAvatarForIdentity:identity];
+  item.text = identity.userEmail;
+  item.chromeIdentity = identity;
+  item.accessoryType = MDCCollectionViewCellAccessoryDisclosureIndicator;
+}
+
+- (CollectionViewItem*)addAccountItem {
+  CollectionViewAccountItem* item = [[[CollectionViewAccountItem alloc]
+      initWithType:ItemTypeAddAccount] autorelease];
+  item.text =
+      l10n_util::GetNSString(IDS_IOS_OPTIONS_ACCOUNTS_ADD_ACCOUNT_BUTTON);
+  item.image = [UIImage imageNamed:@"settings_accounts_add_account"];
+  return item;
+}
+
+- (CollectionViewItem*)syncItem {
+  AccountControlItem* item =
+      [[[AccountControlItem alloc] initWithType:ItemTypeSync] autorelease];
+  item.text = l10n_util::GetNSString(IDS_IOS_OPTIONS_ACCOUNTS_SYNC_TITLE);
+  item.accessibilityIdentifier = kSettingsAccountsSyncCellId;
+  [self updateSyncItem:item];
+  item.accessoryType = MDCCollectionViewCellAccessoryDisclosureIndicator;
+  return item;
+}
+
+- (void)updateSyncItem:(AccountControlItem*)syncItem {
+  SyncSetupService* syncSetupService =
+      SyncSetupServiceFactory::GetForBrowserState(_browserState);
+  if (!syncSetupService->HasFinishedInitialSetup()) {
+    syncItem.image = [UIImage imageNamed:@"settings_sync"];
+    syncItem.detailText =
+        l10n_util::GetNSString(IDS_IOS_SYNC_SETUP_IN_PROGRESS);
+    syncItem.shouldDisplayError = NO;
+    return;
+  }
+
+  ChromeIdentity* identity = [self authService]->GetAuthenticatedIdentity();
+  bool hasSyncError = !ios_internal::sync::IsTransientSyncError(
+      syncSetupService->GetSyncServiceState());
+  bool hasMDMError = [self authService]->HasCachedMDMErrorForIdentity(identity);
+  if (hasSyncError || hasMDMError) {
+    syncItem.image = [UIImage imageNamed:@"settings_error"];
+    syncItem.detailText =
+        ios_internal::sync::GetSyncErrorDescriptionForBrowserState(
+            _browserState);
+    syncItem.shouldDisplayError = YES;
+  } else {
+    syncItem.image = [UIImage imageNamed:@"settings_sync"];
+    syncItem.detailText =
+        syncSetupService->IsSyncEnabled()
+            ? l10n_util::GetNSStringF(
+                  IDS_IOS_SIGN_IN_TO_CHROME_SETTING_SYNCING,
+                  base::SysNSStringToUTF16([identity userEmail]))
+            : l10n_util::GetNSString(IDS_IOS_OPTIONS_ACCOUNTS_SYNC_IS_OFF);
+    syncItem.shouldDisplayError = NO;
+  }
+}
+
+- (CollectionViewItem*)googleActivityControlsItem {
+  AccountControlItem* item = [[[AccountControlItem alloc]
+      initWithType:ItemTypeGoogleActivityControls] autorelease];
+  item.text = l10n_util::GetNSString(IDS_IOS_OPTIONS_ACCOUNTS_GOOGLE_TITLE);
+  item.detailText =
+      l10n_util::GetNSString(IDS_IOS_OPTIONS_ACCOUNTS_GOOGLE_DESCRIPTION);
+  item.image = ios::GetChromeBrowserProvider()
+                   ->GetBrandedImageProvider()
+                   ->GetAccountsListActivityControlsImage();
+  item.accessoryType = MDCCollectionViewCellAccessoryDisclosureIndicator;
+  return item;
+}
+
+- (CollectionViewItem*)signOutItem {
+  CollectionViewTextItem* item = [[[CollectionViewTextItem alloc]
+      initWithType:ItemTypeSignOut] autorelease];
+  item.text = l10n_util::GetNSString(IDS_IOS_OPTIONS_ACCOUNTS_SIGNOUT);
+  item.accessibilityTraits |= UIAccessibilityTraitButton;
+  item.accessibilityIdentifier = kSettingsAccountsSignoutCellId;
+  return item;
+}
+
+#pragma mark - UICollectionViewDelegate
+
+- (void)collectionView:(UICollectionView*)collectionView
+    didSelectItemAtIndexPath:(NSIndexPath*)indexPath {
+  [super collectionView:collectionView didSelectItemAtIndexPath:indexPath];
+
+  NSInteger itemType =
+      [self.collectionViewModel itemTypeForIndexPath:indexPath];
+
+  switch (itemType) {
+    case ItemTypeAccount: {
+      CollectionViewAccountItem* item =
+          base::mac::ObjCCastStrict<CollectionViewAccountItem>(
+              [self.collectionViewModel itemAtIndexPath:indexPath]);
+      DCHECK(item.chromeIdentity);
+      [self showAccountDetails:item.chromeIdentity];
+      break;
+    }
+    case ItemTypeAddAccount:
+      [self showAddAccount];
+      break;
+    case ItemTypeSync:
+      [self showSyncSettings];
+      break;
+    case ItemTypeGoogleActivityControls:
+      [self showGoogleActivitySettings];
+      break;
+    case ItemTypeSignOut:
+      [self showDisconnect];
+      break;
+    default:
+      break;
+  }
+}
+
+#pragma mark - UICollectionViewDataSource
+
+- (UICollectionReusableView*)collectionView:(UICollectionView*)collectionView
+          viewForSupplementaryElementOfKind:(NSString*)kind
+                                atIndexPath:(NSIndexPath*)indexPath {
+  UICollectionReusableView* view = [super collectionView:collectionView
+                       viewForSupplementaryElementOfKind:kind
+                                             atIndexPath:indexPath];
+  MDCCollectionViewTextCell* textCell =
+      base::mac::ObjCCast<MDCCollectionViewTextCell>(view);
+  if (textCell) {
+    textCell.textLabel.textColor = [[MDCPalette greyPalette] tint500];
+  }
+  return view;
+}
+
+#pragma mark - MDCCollectionViewStylingDelegate
+
+- (CGFloat)collectionView:(UICollectionView*)collectionView
+    cellHeightAtIndexPath:(NSIndexPath*)indexPath {
+  CollectionViewItem* item =
+      [self.collectionViewModel itemAtIndexPath:indexPath];
+  if (item.type == ItemTypeGoogleActivityControls ||
+      item.type == ItemTypeSync) {
+    return [MDCCollectionViewCell
+        cr_preferredHeightForWidth:CGRectGetWidth(collectionView.bounds)
+                           forItem:item];
+  } else if (item.type == ItemTypeSignOut) {
+    return MDCCellDefaultOneLineHeight;
+  }
+  return MDCCellDefaultTwoLineHeight;
+}
+
+#pragma mark - SyncObserverModelBridge
+
+- (void)onSyncStateChanged {
+  if (![self authService]->IsAuthenticated()) {
+    // Ignore sync state changed notification if signed out.
+    return;
+  }
+
+  NSIndexPath* index =
+      [self.collectionViewModel indexPathForItemType:ItemTypeSync
+                                   sectionIdentifier:SectionIdentifierSync];
+
+  CollectionViewModel* model = self.collectionViewModel;
+  if ([model numberOfSections] > index.section &&
+      [model numberOfItemsInSection:index.section] > index.row) {
+    AccountControlItem* item = base::mac::ObjCCastStrict<AccountControlItem>(
+        [model itemAtIndexPath:index]);
+    [self updateSyncItem:item];
+    [self.collectionView reloadItemsAtIndexPaths:@[ index ]];
+  }
+}
+
+#pragma mark - OAuth2TokenServiceObserverBridgeDelegate
+
+- (void)onEndBatchChanges {
+  [self reloadData];
+  [self popViewIfSignedOut];
+  if (![self authService]->IsAuthenticated() && _settingsDetails) {
+    [_settingsDetails dismissViewControllerAnimated:YES completion:nil];
+    _settingsDetails.reset();
+  }
+}
+
+#pragma mark - Sync and Activity Controls
+
+- (void)showSyncSettings {
+  if ([_alertCoordinator isVisible])
+    return;
+
+  if ([self authService]->ShowMDMErrorDialogForIdentity(
+          [self authService]->GetAuthenticatedIdentity())) {
+    // If there is an MDM error for the synced identity, show it instead.
+    return;
+  }
+
+  base::scoped_nsobject<UIViewController> controllerToPush(
+      [[SyncSettingsCollectionViewController alloc]
+            initWithBrowserState:_browserState
+          allowSwitchSyncAccount:YES]);
+  [self.navigationController pushViewController:controllerToPush animated:YES];
+}
+
+- (void)showGoogleActivitySettings {
+  if ([_alertCoordinator isVisible])
+    return;
+  base::RecordAction(base::UserMetricsAction(
+      "Signin_AccountSettings_GoogleActivityControlsClicked"));
+  base::scoped_nsobject<UINavigationController> settingsDetails(
+      ios::GetChromeBrowserProvider()
+          ->GetChromeIdentityService()
+          ->NewWebAndAppSettingDetails(
+              [self authService]->GetAuthenticatedIdentity(), self));
+  UIImage* closeIcon = [ChromeIcon closeIcon];
+  SEL action = @selector(closeGoogleActivitySettings:);
+  [settingsDetails.get().topViewController navigationItem].leftBarButtonItem =
+      [ChromeIcon templateBarButtonItemWithImage:closeIcon
+                                          target:self
+                                          action:action];
+  [self presentViewController:settingsDetails animated:YES completion:nil];
+
+  // Keep a weak reference on the settings details, to be able to dismiss it
+  // when the primary account is removed.
+  _settingsDetails.reset(settingsDetails);
+}
+
+- (void)closeGoogleActivitySettings:(id)sender {
+  DCHECK(_settingsDetails);
+  [self dismissViewControllerAnimated:YES completion:nil];
+}
+
+#pragma mark - Authentication operations
+
+- (void)showAddAccount {
+  if ([_alertCoordinator isVisible])
+    return;
+  if (_signinInteractionController) {
+    // Ignore this user action if there is already an add account operation
+    // in-progress.
+    return;
+  }
+  _signinInteractionController.reset([[SigninInteractionController alloc]
+          initWithBrowserState:_browserState
+      presentingViewController:self.navigationController
+         isPresentedOnSettings:YES
+             signInAccessPoint:signin_metrics::AccessPoint::
+                                   ACCESS_POINT_SETTINGS]);
+
+  // |_authenticationOperationInProgress| is reset when the signin interaction
+  // controller is dismissed.
+  _authenticationOperationInProgress = YES;
+  base::WeakNSObject<AccountsCollectionViewController> weakSelf(self);
+  [_signinInteractionController addAccountWithCompletion:^(BOOL success) {
+    [weakSelf handleDidAddAccount:success];
+  }
+                                          viewController:self];
+}
+
+- (void)handleDidAddAccount:(BOOL)success {
+  _signinInteractionController.reset();
+  [self handleAuthenticationOperationDidFinish];
+  if (success && _closeSettingsOnAddAccount) {
+    base::scoped_nsobject<GenericChromeCommand> closeSettingsCommand(
+        [[GenericChromeCommand alloc] initWithTag:IDC_CLOSE_SETTINGS]);
+    [self chromeExecuteCommand:closeSettingsCommand];
+  }
+}
+
+- (void)showAccountDetails:(ChromeIdentity*)identity {
+  if ([_alertCoordinator isVisible])
+    return;
+  base::scoped_nsobject<UIViewController> accountDetails(
+      ios::GetChromeBrowserProvider()
+          ->GetChromeIdentityService()
+          ->NewAccountDetails(identity, self));
+  if (!accountDetails) {
+    // Failed to create a new account details. Ignored.
+    return;
+  }
+  [self presentViewController:accountDetails animated:YES completion:nil];
+
+  // Keep a weak reference on the account details, to be able to dismiss it
+  // when the primary account is removed.
+  _settingsDetails.reset(accountDetails);
+}
+
+- (void)showDisconnect {
+  if (_authenticationOperationInProgress || [_alertCoordinator isVisible] ||
+      self != [self.navigationController topViewController]) {
+    // An action is already in progress, ignore user's request.
+    return;
+  }
+
+  NSString* title;
+  NSString* message;
+  NSString* continueButtonTitle;
+  if ([self authService]->IsAuthenticatedIdentityManaged()) {
+    std::string hosted_domain =
+        ios::SigninManagerFactory::GetForBrowserState(_browserState)
+            ->GetAuthenticatedAccountInfo()
+            .hosted_domain;
+    title = l10n_util::GetNSString(IDS_IOS_MANAGED_DISCONNECT_DIALOG_TITLE);
+    message = l10n_util::GetNSStringF(IDS_IOS_MANAGED_DISCONNECT_DIALOG_INFO,
+                                      base::UTF8ToUTF16(hosted_domain));
+    continueButtonTitle =
+        l10n_util::GetNSString(IDS_IOS_MANAGED_DISCONNECT_DIALOG_ACCEPT);
+  } else {
+    title = l10n_util::GetNSString(IDS_IOS_DISCONNECT_DIALOG_TITLE);
+    message = l10n_util::GetNSString(IDS_IOS_DISCONNECT_DIALOG_INFO_MOBILE);
+    continueButtonTitle = l10n_util::GetNSString(
+        IDS_IOS_DISCONNECT_DIALOG_CONTINUE_BUTTON_MOBILE);
+  }
+  _alertCoordinator.reset([[AlertCoordinator alloc]
+      initWithBaseViewController:self
+                           title:title
+                         message:message]);
+
+  [_alertCoordinator addItemWithTitle:l10n_util::GetNSString(IDS_CANCEL)
+                               action:nil
+                                style:UIAlertActionStyleCancel];
+  base::WeakNSObject<AccountsCollectionViewController> weakSelf(self);
+  [_alertCoordinator addItemWithTitle:continueButtonTitle
+                               action:^{
+                                 [weakSelf handleDisconnect];
+                               }
+                                style:UIAlertActionStyleDefault];
+  [_alertCoordinator start];
+}
+
+- (void)handleDisconnect {
+  AuthenticationService* authService = [self authService];
+  if (authService->IsAuthenticated()) {
+    _authenticationOperationInProgress = YES;
+    [self preventUserInteraction];
+    authService->SignOut(signin_metrics::USER_CLICKED_SIGNOUT_SETTINGS, ^{
+      [self allowUserInteraction];
+      _authenticationOperationInProgress = NO;
+      [base::mac::ObjCCastStrict<SettingsNavigationController>(
+          self.navigationController)
+          popViewControllerOrCloseSettingsAnimated:YES];
+    });
+  }
+}
+
+// Sets |_authenticationOperationInProgress| to NO and pops this accounts
+// collection view controller if the user is signed out.
+- (void)handleAuthenticationOperationDidFinish {
+  DCHECK(_authenticationOperationInProgress);
+  _authenticationOperationInProgress = NO;
+  [self popViewIfSignedOut];
+}
+
+- (void)popViewIfSignedOut {
+  if ([self authService]->IsAuthenticated()) {
+    return;
+  }
+  if (_authenticationOperationInProgress) {
+    // The signed out state might be temporary (e.g. account switch, ...).
+    // Don't pop this view based on intermediary values.
+    return;
+  }
+  [self dismissSelfAnimated:NO];
+}
+
+- (void)dismissSelfAnimated:(BOOL)animated {
+  if (_isBeingDismissed) {
+    return;
+  }
+  _isBeingDismissed = YES;
+  [_signinInteractionController cancelAndDismiss];
+  [_alertCoordinator stop];
+  [self.navigationController popToViewController:self animated:NO];
+  [base::mac::ObjCCastStrict<SettingsNavigationController>(
+      self.navigationController)
+      popViewControllerOrCloseSettingsAnimated:animated];
+}
+
+#pragma mark - Access to authentication service
+
+- (AuthenticationService*)authService {
+  return AuthenticationServiceFactory::GetForBrowserState(_browserState);
+}
+
+#pragma mark - Switch accounts notifications
+
+- (void)willStartSwitchAccount {
+  _authenticationOperationInProgress = YES;
+}
+
+- (void)didFinishSwitchAccount {
+  [self handleAuthenticationOperationDidFinish];
+}
+
+#pragma mark - ChromeIdentityBrowserOpener
+
+- (void)openURL:(NSURL*)url
+              view:(UIView*)view
+    viewController:(UIViewController*)viewController {
+  base::scoped_nsobject<OpenUrlCommand> command(
+      [[OpenUrlCommand alloc] initWithURLFromChrome:net::GURLWithNSURL(url)]);
+  [command setTag:IDC_CLOSE_SETTINGS_AND_OPEN_URL];
+  [self chromeExecuteCommand:command];
+}
+
+#pragma mark - ChromeIdentityServiceObserver
+
+- (void)onProfileUpdate:(ChromeIdentity*)identity {
+  CollectionViewAccountItem* item =
+      base::mac::ObjCCastStrict<CollectionViewAccountItem>(
+          [_identityMap objectForKey:identity.gaiaID]);
+  [self updateAccountItem:item withIdentity:identity];
+  NSIndexPath* indexPath =
+      [self.collectionViewModel indexPathForItem:item
+                         inSectionWithIdentifier:SectionIdentifierAccounts];
+  [self.collectionView reloadItemsAtIndexPaths:@[ indexPath ]];
+}
+
+- (void)onChromeIdentityServiceWillBeDestroyed {
+  _identityServiceObserver.reset();
+}
+
+@end