[iOS] Plugging user consent preferences to the Google service settings

When the switch is toggled, the preference is updated, but the cell
should not be reloaded (to let the animation finish).
The UI is reloaded only when a value update notification is received
without user action.

When the user consent is removed, all sections are expanded and all
cells inside are enabled to be modified.

https://drive.google.com/open?id=1hvi5LyGjBDODkRQymvC5sbUjSN9tafFz

Bug: 827072, 849838
Cq-Include-Trybots: luci.chromium.try:ios-simulator-full-configs;master.tryserver.chromium.mac:ios-simulator-cronet
Change-Id: I5bc39e1ee80d8844e56900a7a22e8201a3e2d411
Reviewed-on: https://chromium-review.googlesource.com/1144934
Commit-Queue: Jérôme Lebel <jlebel@chromium.org>
Reviewed-by: Sergio Collazos <sczs@chromium.org>
Cr-Commit-Position: refs/heads/master@{#580830}

ios/chrome/browser/ui/settings/google_services_settings_consumer.h

@@ -16,6 +16,9 @@
 @property(nonatomic, strong, readonly)
     CollectionViewModel<CollectionViewItem*>* collectionViewModel;
 
+// Reloads |sections|.
+- (void)reloadSections:(NSIndexSet*)sections;
+
 @end
 
 #endif  // IOS_CHROME_BROWSER_UI_SETTINGS_GOOGLE_SERVICES_SETTINGS_CONSUMER_H_

ios/chrome/browser/ui/settings/google_services_settings_mediator.h

@@ -29,7 +29,7 @@ class PrefService;
 
 // View controller.
 @property(nonatomic, weak) id<GoogleServicesSettingsConsumer> consumer;
-// Browser state.
+// Authentication service.
 @property(nonatomic, assign) AuthenticationService* authService;
 
 @end

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

@@ -4,10 +4,15 @@
 
 #import "ios/chrome/browser/ui/settings/google_services_settings_mediator.h"
 
+#include "base/auto_reset.h"
+#include "base/mac/foundation_util.h"
+#import "components/prefs/ios/pref_observer_bridge.h"
+#include "components/prefs/pref_change_registrar.h"
 #include "components/prefs/pref_service.h"
 #include "components/unified_consent/pref_names.h"
 #import "ios/chrome/browser/signin/authentication_service.h"
 #import "ios/chrome/browser/signin/authentication_service_factory.h"
+#include "ios/chrome/browser/sync/sync_setup_service.h"
 #import "ios/chrome/browser/ui/collection_view/cells/collection_view_item.h"
 #import "ios/chrome/browser/ui/collection_view/cells/collection_view_text_item.h"
 #import "ios/chrome/browser/ui/settings/cells/settings_collapsible_item.h"
@@ -24,6 +29,8 @@
 using l10n_util::GetNSString;
 using unified_consent::prefs::kUnifiedConsentGiven;
 
+typedef NSArray<CollectionViewItem*>* ItemArray;
+
 namespace {
 
 // List of sections.
@@ -66,12 +73,35 @@ typedef NS_ENUM(NSInteger, ItemType) {
 
 }  // namespace
 
-@interface GoogleServicesSettingsMediator ()
+@interface GoogleServicesSettingsMediator ()<PrefObserverDelegate> {
+  // Bridge to listen to pref changes.
+  std::unique_ptr<PrefObserverBridge> prefObserverBridge_;
+  // Registrar for pref changes notifications.
+  PrefChangeRegistrar prefChangeRegistrar_;
+}
 
 // Returns YES if the user is authenticated.
-@property(nonatomic, readonly) BOOL isAuthenticated;
+@property(nonatomic, assign, readonly) BOOL isAuthenticated;
+// Returns YES if the user has given his consent to use Google services.
+@property(nonatomic, assign, readonly) BOOL isConsentGiven;
 // Preference service.
-@property(nonatomic, readonly) PrefService* prefService;
+@property(nonatomic, assign, readonly) PrefService* prefService;
+
+// YES if the switch for |syncEverythingItem| is currently animating from one
+// state to another.
+@property(nonatomic, assign, readwrite) BOOL syncEverythingSwitchBeingAnimated;
+// Item for "Sync Everything" section.
+@property(nonatomic, strong, readonly) SyncSwitchItem* syncEverythingItem;
+// Collapsible item for the personalized section.
+@property(nonatomic, strong, readonly)
+    SettingsCollapsibleItem* syncPersonalizationItem;
+// All the items for the personalized section.
+@property(nonatomic, strong, readonly) ItemArray personalizedItems;
+// Collapsible item for the non-personalized section.
+@property(nonatomic, strong, readonly)
+    SettingsCollapsibleItem* nonPersonalizedServicesItem;
+// All the items for the non-personalized section.
+@property(nonatomic, strong, readonly) ItemArray nonPersonalizedItems;
 
 @end
 
@@ -80,6 +110,13 @@ typedef NS_ENUM(NSInteger, ItemType) {
 @synthesize consumer = _consumer;
 @synthesize authService = _authService;
 @synthesize prefService = _prefService;
+@synthesize syncEverythingSwitchBeingAnimated =
+    _syncEverythingSwitchBeingAnimated;
+@synthesize syncEverythingItem = _syncEverythingItem;
+@synthesize syncPersonalizationItem = _syncPersonalizationItem;
+@synthesize personalizedItems = _personalizedItems;
+@synthesize nonPersonalizedServicesItem = _nonPersonalizedServicesItem;
+@synthesize nonPersonalizedItems = _nonPersonalizedItems;
 
 #pragma mark - Load model
 
@@ -88,6 +125,10 @@ typedef NS_ENUM(NSInteger, ItemType) {
   if (self) {
     DCHECK(prefService);
     _prefService = prefService;
+    prefObserverBridge_ = std::make_unique<PrefObserverBridge>(self);
+    prefChangeRegistrar_.Init(prefService);
+    prefObserverBridge_->ObserveChangesForPreference(kUnifiedConsentGiven,
+                                                     &prefChangeRegistrar_);
   }
   return self;
 }
@@ -96,19 +137,9 @@ typedef NS_ENUM(NSInteger, ItemType) {
 - (void)loadSyncEverythingSection {
   CollectionViewModel* model = self.consumer.collectionViewModel;
   [model addSectionWithIdentifier:SyncEverythingSectionIdentifier];
-  [model addItem:[self syncEverythingItem]
+  [model addItem:self.syncEverythingItem
       toSectionWithIdentifier:SyncEverythingSectionIdentifier];
-}
-
-// Creates SyncEverythingItemType item.
-- (CollectionViewItem*)syncEverythingItem {
-  SyncSwitchItem* item =
-      [[SyncSwitchItem alloc] initWithType:SyncEverythingItemType];
-  item.text = GetNSString(IDS_IOS_GOOGLE_SERVICES_SETTINGS_SYNC_EVERYTHING);
-  item.enabled = YES;
-  item.on = [self isConsentGiven];
-  item.commandID = GoogleServicesSettingsCommandIDToggleSyncEverything;
-  return item;
+  self.syncEverythingItem.on = self.isConsentGiven;
 }
 
 // Loads PersonalizedSectionIdentifier section.
@@ -118,165 +149,16 @@ typedef NS_ENUM(NSInteger, ItemType) {
   [model setSectionIdentifier:PersonalizedSectionIdentifier
                  collapsedKey:kGoogleServicesSettingsPersonalizedSectionKey];
   SettingsCollapsibleItem* syncPersonalizationItem =
-      [self syncPersonalizationItem];
+      self.syncPersonalizationItem;
   [model addItem:syncPersonalizationItem
       toSectionWithIdentifier:PersonalizedSectionIdentifier];
-  BOOL collapsed = self.isAuthenticated ? [self isConsentGiven] : YES;
+  BOOL collapsed = self.isAuthenticated ? self.isConsentGiven : YES;
   syncPersonalizationItem.collapsed = collapsed;
   [model setSection:PersonalizedSectionIdentifier collapsed:collapsed];
-  [model addItem:[self syncBookmarksItem]
-      toSectionWithIdentifier:PersonalizedSectionIdentifier];
-  [model addItem:[self syncHistoryItem]
-      toSectionWithIdentifier:PersonalizedSectionIdentifier];
-  [model addItem:[self syncPasswordsItem]
-      toSectionWithIdentifier:PersonalizedSectionIdentifier];
-  [model addItem:[self syncOpenTabsItem]
-      toSectionWithIdentifier:PersonalizedSectionIdentifier];
-  [model addItem:[self syncAutofillItem]
-      toSectionWithIdentifier:PersonalizedSectionIdentifier];
-  [model addItem:[self syncReadingListItem]
-      toSectionWithIdentifier:PersonalizedSectionIdentifier];
-  [model addItem:[self syncActivityAndInteractionsItem]
-      toSectionWithIdentifier:PersonalizedSectionIdentifier];
-  [model addItem:[self syncGoogleActivityControlsItem]
-      toSectionWithIdentifier:PersonalizedSectionIdentifier];
-  [model addItem:[self encryptionItem]
-      toSectionWithIdentifier:PersonalizedSectionIdentifier];
-  [model addItem:[self manageSyncedDataItem]
-      toSectionWithIdentifier:PersonalizedSectionIdentifier];
-}
-
-// Creates SyncPersonalizationItemType item.
-- (SettingsCollapsibleItem*)syncPersonalizationItem {
-  SettingsCollapsibleItem* item = [[SettingsCollapsibleItem alloc]
-      initWithType:SyncPersonalizationItemType];
-  item.text =
-      GetNSString(IDS_IOS_GOOGLE_SERVICES_SETTINGS_SYNC_PERSONALIZATION_TEXT);
-  item.numberOfTextLines = 0;
-  if (!self.isAuthenticated)
-    item.textColor = [[MDCPalette greyPalette] tint500];
-  item.detailText =
-      GetNSString(IDS_IOS_GOOGLE_SERVICES_SETTINGS_SYNC_PERSONALIZATION_DETAIL);
-  item.numberOfDetailTextLines = 0;
-  return item;
-}
-
-// Creates SyncBookmarksItemType item.
-- (CollectionViewItem*)syncBookmarksItem {
-  SyncSwitchItem* item =
-      [[SyncSwitchItem alloc] initWithType:SyncBookmarksItemType];
-  item.text = GetNSString(IDS_IOS_GOOGLE_SERVICES_SETTINGS_BOOKMARKS_TEXT);
-  item.enabled = self.isAuthenticated;
-  item.commandID = GoogleServicesSettingsCommandIDToggleBookmarkSync;
-  return item;
-}
-
-// Creates SyncHistoryItemType item.
-- (CollectionViewItem*)syncHistoryItem {
-  SyncSwitchItem* item =
-      [[SyncSwitchItem alloc] initWithType:SyncHistoryItemType];
-  item.text = GetNSString(IDS_IOS_GOOGLE_SERVICES_SETTINGS_HISTORY_TEXT);
-  item.enabled = self.isAuthenticated;
-  item.commandID = GoogleServicesSettingsCommandIDToggleHistorySync;
-  return item;
-}
-
-// Creates SyncPasswordsItemType item.
-- (CollectionViewItem*)syncPasswordsItem {
-  SyncSwitchItem* item =
-      [[SyncSwitchItem alloc] initWithType:SyncPasswordsItemType];
-  item.text = GetNSString(IDS_IOS_GOOGLE_SERVICES_SETTINGS_PASSWORD_TEXT);
-  item.enabled = self.isAuthenticated;
-  item.commandID = GoogleServicesSettingsCommandIDTogglePasswordsSync;
-  return item;
-}
-
-// Creates SyncOpenTabsItemType item.
-- (CollectionViewItem*)syncOpenTabsItem {
-  SyncSwitchItem* item =
-      [[SyncSwitchItem alloc] initWithType:SyncOpenTabsItemType];
-  item.text = GetNSString(IDS_IOS_GOOGLE_SERVICES_SETTINGS_OPENTABS_TEXT);
-  item.enabled = self.isAuthenticated;
-  item.commandID = GoogleServicesSettingsCommandIDToggleOpenTabsSync;
-  return item;
-}
-
-// Creates SyncAutofillItemType item.
-- (CollectionViewItem*)syncAutofillItem {
-  SyncSwitchItem* item =
-      [[SyncSwitchItem alloc] initWithType:SyncAutofillItemType];
-  item.text = GetNSString(IDS_IOS_GOOGLE_SERVICES_SETTINGS_AUTOFILL_TEXT);
-  item.enabled = self.isAuthenticated;
-  item.commandID = GoogleServicesSettingsCommandIDToggleAutofillSync;
-  return item;
-}
-
-// Creates SyncReadingListItemType item.
-- (CollectionViewItem*)syncReadingListItem {
-  SyncSwitchItem* item =
-      [[SyncSwitchItem alloc] initWithType:SyncReadingListItemType];
-  item.text = GetNSString(IDS_IOS_GOOGLE_SERVICES_SETTINGS_READING_LIST_TEXT);
-  item.enabled = self.isAuthenticated;
-  item.commandID = GoogleServicesSettingsCommandIDToggleReadingListSync;
-  return item;
-}
-
-// Creates SyncActivityAndInteractionsItemType item.
-- (CollectionViewItem*)syncActivityAndInteractionsItem {
-  SyncSwitchItem* item =
-      [[SyncSwitchItem alloc] initWithType:SyncActivityAndInteractionsItemType];
-  item.text = GetNSString(
-      IDS_IOS_GOOGLE_SERVICES_SETTINGS_ACTIVITY_AND_INTERACTIONS_TEXT);
-  item.detailText = GetNSString(
-      IDS_IOS_GOOGLE_SERVICES_SETTINGS_ACTIVITY_AND_INTERACTIONS_DETAIL);
-  item.enabled = self.isAuthenticated;
-  item.commandID =
-      GoogleServicesSettingsCommandIDToggleActivityAndInteractionsService;
-  return item;
-}
-
-// Creates SyncGoogleActivityControlsItemType item.
-- (CollectionViewItem*)syncGoogleActivityControlsItem {
-  CollectionViewTextItem* item = [[CollectionViewTextItem alloc]
-      initWithType:SyncGoogleActivityControlsItemType];
-  item.text = GetNSString(
-      IDS_IOS_GOOGLE_SERVICES_SETTINGS_GOOGLE_ACTIVITY_CONTROL_TEXT);
-  item.numberOfTextLines = 0;
-  if (!self.isAuthenticated)
-    item.textColor = [[MDCPalette greyPalette] tint500];
-  item.detailText = GetNSString(
-      IDS_IOS_GOOGLE_SERVICES_SETTINGS_GOOGLE_ACTIVITY_CONTROL_DETAIL);
-  item.numberOfDetailTextLines = 0;
-  item.accessoryType = MDCCollectionViewCellAccessoryDisclosureIndicator;
-  item.commandID = GoogleServicesSettingsCommandIDOpenGoogleActivityPage;
-  return item;
-}
-
-// Creates EncryptionItemType item.
-- (CollectionViewItem*)encryptionItem {
-  CollectionViewTextItem* item =
-      [[CollectionViewTextItem alloc] initWithType:EncryptionItemType];
-  item.text = GetNSString(IDS_IOS_GOOGLE_SERVICES_SETTINGS_ENCRYPTION_TEXT);
-  item.numberOfTextLines = 0;
-  if (!self.isAuthenticated)
-    item.textColor = [[MDCPalette greyPalette] tint500];
-  item.numberOfDetailTextLines = 0;
-  item.accessoryType = MDCCollectionViewCellAccessoryDisclosureIndicator;
-  item.commandID = GoogleServicesSettingsCommandIDOpenEncryptionDialog;
-  return item;
-}
-
-// Creates ManageSyncedDataItemType item.
-- (CollectionViewItem*)manageSyncedDataItem {
-  CollectionViewTextItem* item =
-      [[CollectionViewTextItem alloc] initWithType:ManageSyncedDataItemType];
-  item.text =
-      GetNSString(IDS_IOS_GOOGLE_SERVICES_SETTINGS_MANAGED_SYNC_DATA_TEXT);
-  item.numberOfTextLines = 0;
-  if (!self.isAuthenticated)
-    item.textColor = [[MDCPalette greyPalette] tint500];
-  item.commandID = GoogleServicesSettingsCommandIDOpenManageSyncedDataPage;
-  return item;
+  for (CollectionViewItem* item in self.personalizedItems) {
+    [model addItem:item toSectionWithIdentifier:PersonalizedSectionIdentifier];
+  }
+  [self updatePersonalizedSection];
 }
 
 // Loads NonPersonalizedSectionIdentifier section.
@@ -286,88 +168,20 @@ typedef NS_ENUM(NSInteger, ItemType) {
   [model setSectionIdentifier:NonPersonalizedSectionIdentifier
                  collapsedKey:kGoogleServicesSettingsNonPersonalizedSectionKey];
   SettingsCollapsibleItem* nonPersonalizedServicesItem =
-      [self nonPersonalizedServicesItem];
+      self.nonPersonalizedServicesItem;
   [model addItem:nonPersonalizedServicesItem
       toSectionWithIdentifier:NonPersonalizedSectionIdentifier];
-  BOOL collapsed = self.isAuthenticated ? [self isConsentGiven] : NO;
+  BOOL collapsed = self.isAuthenticated ? self.isConsentGiven : NO;
   nonPersonalizedServicesItem.collapsed = collapsed;
   [model setSection:NonPersonalizedSectionIdentifier collapsed:collapsed];
-  [model addItem:[self autocompleteSearchesAndURLsItem]
-      toSectionWithIdentifier:NonPersonalizedSectionIdentifier];
-  [model addItem:[self preloadPagesItem]
-      toSectionWithIdentifier:NonPersonalizedSectionIdentifier];
-  [model addItem:[self improveChromeItem]
-      toSectionWithIdentifier:NonPersonalizedSectionIdentifier];
-  [model addItem:[self betterSearchAndBrowsingItemType]
-      toSectionWithIdentifier:NonPersonalizedSectionIdentifier];
-}
-
-// Creates NonPersonalizedServicesItemType item.
-- (SettingsCollapsibleItem*)nonPersonalizedServicesItem {
-  SettingsCollapsibleItem* item = [[SettingsCollapsibleItem alloc]
-      initWithType:NonPersonalizedServicesItemType];
-  item.text = GetNSString(
-      IDS_IOS_GOOGLE_SERVICES_SETTINGS_NON_PERSONALIZED_SERVICES_TEXT);
-  item.numberOfTextLines = 0;
-  item.detailText = GetNSString(
-      IDS_IOS_GOOGLE_SERVICES_SETTINGS_NON_PERSONALIZED_SERVICES_DETAIL);
-  item.numberOfDetailTextLines = 0;
-  return item;
-}
-
-// Creates AutocompleteSearchesAndURLsItemType item.
-- (CollectionViewItem*)autocompleteSearchesAndURLsItem {
-  SyncSwitchItem* item =
-      [[SyncSwitchItem alloc] initWithType:AutocompleteSearchesAndURLsItemType];
-  item.text = GetNSString(
-      IDS_IOS_GOOGLE_SERVICES_SETTINGS_AUTOCOMPLETE_SEARCHES_AND_URLS_TEXT);
-  item.detailText = GetNSString(
-      IDS_IOS_GOOGLE_SERVICES_SETTINGS_AUTOCOMPLETE_SEARCHES_AND_URLS_DETAIL);
-  item.commandID =
-      GoogleServicesSettingsCommandIDToggleAutocompleteSearchesService;
-  item.enabled = YES;
-  return item;
-}
-
-// Creates PreloadPagesItemType item.
-- (CollectionViewItem*)preloadPagesItem {
-  SyncSwitchItem* item =
-      [[SyncSwitchItem alloc] initWithType:PreloadPagesItemType];
-  item.text = GetNSString(IDS_IOS_GOOGLE_SERVICES_SETTINGS_PRELOAD_PAGES_TEXT);
-  item.detailText =
-      GetNSString(IDS_IOS_GOOGLE_SERVICES_SETTINGS_PRELOAD_PAGES_DETAIL);
-  item.enabled = YES;
-  item.commandID = GoogleServicesSettingsCommandIDTogglePreloadPagesService;
-  return item;
-}
-
-// Creates ImproveChromeItemType item.
-- (CollectionViewItem*)improveChromeItem {
-  SyncSwitchItem* item =
-      [[SyncSwitchItem alloc] initWithType:ImproveChromeItemType];
-  item.text = GetNSString(IDS_IOS_GOOGLE_SERVICES_SETTINGS_IMPROVE_CHROME_TEXT);
-  item.detailText =
-      GetNSString(IDS_IOS_GOOGLE_SERVICES_SETTINGS_IMPROVE_CHROME_DETAIL);
-  item.enabled = YES;
-  item.commandID = GoogleServicesSettingsCommandIDToggleImproveChromeService;
-  return item;
-}
-
-// Creates BetterSearchAndBrowsingItemType item.
-- (CollectionViewItem*)betterSearchAndBrowsingItemType {
-  SyncSwitchItem* item =
-      [[SyncSwitchItem alloc] initWithType:BetterSearchAndBrowsingItemType];
-  item.text = GetNSString(
-      IDS_IOS_GOOGLE_SERVICES_SETTINGS_BETTER_SEARCH_AND_BROWSING_TEXT);
-  item.detailText = GetNSString(
-      IDS_IOS_GOOGLE_SERVICES_SETTINGS_BETTER_SEARCH_AND_BROWSING_DETAIL);
-  item.enabled = YES;
-  item.commandID =
-      GoogleServicesSettingsCommandIDToggleBetterSearchAndBrowsingService;
-  return item;
+  for (CollectionViewItem* item in self.nonPersonalizedItems) {
+    [model addItem:item
+        toSectionWithIdentifier:NonPersonalizedSectionIdentifier];
+  }
+  [self updateNonPersonalizedSection];
 }
 
-#pragma mark - Private
+#pragma mark - Properties
 
 - (BOOL)isAuthenticated {
   return self.authService->IsAuthenticated();
@@ -377,6 +191,247 @@ typedef NS_ENUM(NSInteger, ItemType) {
   return self.prefService->GetBoolean(kUnifiedConsentGiven);
 }
 
+- (CollectionViewItem*)syncEverythingItem {
+  if (!_syncEverythingItem) {
+    _syncEverythingItem = [self
+        switchItemWithItemType:SyncEverythingItemType
+                  textStringID:IDS_IOS_GOOGLE_SERVICES_SETTINGS_SYNC_EVERYTHING
+                detailStringID:0
+                     commandID:
+                         GoogleServicesSettingsCommandIDToggleSyncEverything];
+  }
+  return _syncEverythingItem;
+}
+
+- (SettingsCollapsibleItem*)syncPersonalizationItem {
+  if (!_syncPersonalizationItem) {
+    _syncPersonalizationItem = [self
+        collapsibleItemWithItemType:SyncPersonalizationItemType
+                       textStringID:
+                           IDS_IOS_GOOGLE_SERVICES_SETTINGS_SYNC_PERSONALIZATION_TEXT
+                     detailStringID:
+                         IDS_IOS_GOOGLE_SERVICES_SETTINGS_SYNC_PERSONALIZATION_DETAIL];
+  }
+  return _syncPersonalizationItem;
+}
+
+- (ItemArray)personalizedItems {
+  if (!_personalizedItems) {
+    SyncSwitchItem* syncBookmarksItem = [self
+        switchItemWithItemType:SyncBookmarksItemType
+                  textStringID:IDS_IOS_GOOGLE_SERVICES_SETTINGS_BOOKMARKS_TEXT
+                detailStringID:0
+                     commandID:
+                         GoogleServicesSettingsCommandIDToggleBookmarkSync];
+    SyncSwitchItem* syncHistoryItem = [self
+        switchItemWithItemType:SyncHistoryItemType
+                  textStringID:IDS_IOS_GOOGLE_SERVICES_SETTINGS_HISTORY_TEXT
+                detailStringID:0
+                     commandID:
+                         GoogleServicesSettingsCommandIDToggleHistorySync];
+    SyncSwitchItem* syncPasswordsItem = [self
+        switchItemWithItemType:SyncPasswordsItemType
+                  textStringID:IDS_IOS_GOOGLE_SERVICES_SETTINGS_PASSWORD_TEXT
+                detailStringID:0
+                     commandID:
+                         GoogleServicesSettingsCommandIDTogglePasswordsSync];
+    SyncSwitchItem* syncOpenTabsItem = [self
+        switchItemWithItemType:SyncOpenTabsItemType
+                  textStringID:IDS_IOS_GOOGLE_SERVICES_SETTINGS_OPENTABS_TEXT
+                detailStringID:0
+                     commandID:
+                         GoogleServicesSettingsCommandIDToggleOpenTabsSync];
+    SyncSwitchItem* syncAutofillItem = [self
+        switchItemWithItemType:SyncAutofillItemType
+                  textStringID:IDS_IOS_GOOGLE_SERVICES_SETTINGS_AUTOFILL_TEXT
+                detailStringID:0
+                     commandID:
+                         GoogleServicesSettingsCommandIDToggleAutofillSync];
+    SyncSwitchItem* syncReadingListItem = [self
+        switchItemWithItemType:SyncReadingListItemType
+                  textStringID:
+                      IDS_IOS_GOOGLE_SERVICES_SETTINGS_READING_LIST_TEXT
+                detailStringID:0
+                     commandID:
+                         GoogleServicesSettingsCommandIDToggleReadingListSync];
+    SyncSwitchItem* syncActivityAndInteractionsItem = [self
+        switchItemWithItemType:SyncActivityAndInteractionsItemType
+                  textStringID:
+                      IDS_IOS_GOOGLE_SERVICES_SETTINGS_ACTIVITY_AND_INTERACTIONS_TEXT
+                detailStringID:
+                    IDS_IOS_GOOGLE_SERVICES_SETTINGS_ACTIVITY_AND_INTERACTIONS_DETAIL
+                     commandID:
+                         GoogleServicesSettingsCommandIDToggleActivityAndInteractionsService];
+    CollectionViewTextItem* syncGoogleActivityControlsItem = [self
+        textItemWithItemType:SyncGoogleActivityControlsItemType
+                textStringID:
+                    IDS_IOS_GOOGLE_SERVICES_SETTINGS_GOOGLE_ACTIVITY_CONTROL_TEXT
+              detailStringID:
+                  IDS_IOS_GOOGLE_SERVICES_SETTINGS_GOOGLE_ACTIVITY_CONTROL_DETAIL
+               accessoryType:MDCCollectionViewCellAccessoryDisclosureIndicator
+                   commandID:
+                       GoogleServicesSettingsCommandIDOpenGoogleActivityPage];
+    CollectionViewTextItem* encryptionItem = [self
+        textItemWithItemType:EncryptionItemType
+                textStringID:IDS_IOS_GOOGLE_SERVICES_SETTINGS_ENCRYPTION_TEXT
+              detailStringID:0
+               accessoryType:MDCCollectionViewCellAccessoryDisclosureIndicator
+                   commandID:
+                       GoogleServicesSettingsCommandIDOpenEncryptionDialog];
+    CollectionViewTextItem* manageSyncedDataItem = [self
+        textItemWithItemType:ManageSyncedDataItemType
+                textStringID:
+                    IDS_IOS_GOOGLE_SERVICES_SETTINGS_MANAGED_SYNC_DATA_TEXT
+              detailStringID:0
+               accessoryType:MDCCollectionViewCellAccessoryNone
+                   commandID:
+                       GoogleServicesSettingsCommandIDOpenManageSyncedDataPage];
+    _personalizedItems = @[
+      syncBookmarksItem, syncHistoryItem, syncPasswordsItem, syncOpenTabsItem,
+      syncAutofillItem, syncReadingListItem, syncActivityAndInteractionsItem,
+      syncGoogleActivityControlsItem, encryptionItem, manageSyncedDataItem
+    ];
+  }
+  return _personalizedItems;
+}
+
+- (SettingsCollapsibleItem*)nonPersonalizedServicesItem {
+  if (!_nonPersonalizedServicesItem) {
+    _nonPersonalizedServicesItem = [self
+        collapsibleItemWithItemType:NonPersonalizedServicesItemType
+                       textStringID:
+                           IDS_IOS_GOOGLE_SERVICES_SETTINGS_NON_PERSONALIZED_SERVICES_TEXT
+                     detailStringID:
+                         IDS_IOS_GOOGLE_SERVICES_SETTINGS_NON_PERSONALIZED_SERVICES_DETAIL];
+  }
+  return _nonPersonalizedServicesItem;
+}
+
+- (ItemArray)nonPersonalizedItems {
+  if (!_nonPersonalizedItems) {
+    SyncSwitchItem* autocompleteSearchesAndURLsItem = [self
+        switchItemWithItemType:AutocompleteSearchesAndURLsItemType
+                  textStringID:
+                      IDS_IOS_GOOGLE_SERVICES_SETTINGS_AUTOCOMPLETE_SEARCHES_AND_URLS_TEXT
+                detailStringID:
+                    IDS_IOS_GOOGLE_SERVICES_SETTINGS_AUTOCOMPLETE_SEARCHES_AND_URLS_DETAIL
+                     commandID:
+                         GoogleServicesSettingsCommandIDToggleAutocompleteSearchesService];
+    SyncSwitchItem* preloadPagesItem = [self
+        switchItemWithItemType:PreloadPagesItemType
+                  textStringID:
+                      IDS_IOS_GOOGLE_SERVICES_SETTINGS_PRELOAD_PAGES_TEXT
+                detailStringID:
+                    IDS_IOS_GOOGLE_SERVICES_SETTINGS_PRELOAD_PAGES_DETAIL
+                     commandID:
+                         GoogleServicesSettingsCommandIDTogglePreloadPagesService];
+    SyncSwitchItem* improveChromeItem = [self
+        switchItemWithItemType:ImproveChromeItemType
+                  textStringID:
+                      IDS_IOS_GOOGLE_SERVICES_SETTINGS_IMPROVE_CHROME_TEXT
+                detailStringID:
+                    IDS_IOS_GOOGLE_SERVICES_SETTINGS_IMPROVE_CHROME_DETAIL
+                     commandID:
+                         GoogleServicesSettingsCommandIDToggleImproveChromeService];
+    SyncSwitchItem* betterSearchAndBrowsingItemType = [self
+        switchItemWithItemType:BetterSearchAndBrowsingItemType
+                  textStringID:
+                      IDS_IOS_GOOGLE_SERVICES_SETTINGS_BETTER_SEARCH_AND_BROWSING_TEXT
+                detailStringID:
+                    IDS_IOS_GOOGLE_SERVICES_SETTINGS_BETTER_SEARCH_AND_BROWSING_DETAIL
+                     commandID:
+                         GoogleServicesSettingsCommandIDToggleBetterSearchAndBrowsingService];
+    _nonPersonalizedItems = @[
+      autocompleteSearchesAndURLsItem, preloadPagesItem, improveChromeItem,
+      betterSearchAndBrowsingItemType
+    ];
+  }
+  return _nonPersonalizedItems;
+}
+
+#pragma mark - Private
+
+// Creates a SettingsCollapsibleItem instance.
+- (SettingsCollapsibleItem*)collapsibleItemWithItemType:(NSInteger)itemType
+                                           textStringID:(int)textStringID
+                                         detailStringID:(int)detailStringID {
+  SettingsCollapsibleItem* collapsibleItem =
+      [[SettingsCollapsibleItem alloc] initWithType:itemType];
+  collapsibleItem.text = GetNSString(textStringID);
+  collapsibleItem.numberOfTextLines = 0;
+  collapsibleItem.detailText = GetNSString(detailStringID);
+  collapsibleItem.numberOfDetailTextLines = 0;
+  return collapsibleItem;
+}
+
+// Creates a SyncSwitchItem instance.
+- (SyncSwitchItem*)switchItemWithItemType:(NSInteger)itemType
+                             textStringID:(int)textStringID
+                           detailStringID:(int)detailStringID
+                                commandID:(NSInteger)commandID {
+  SyncSwitchItem* switchItem = [[SyncSwitchItem alloc] initWithType:itemType];
+  switchItem.text = GetNSString(textStringID);
+  if (detailStringID)
+    switchItem.detailText = GetNSString(detailStringID);
+  switchItem.commandID = commandID;
+  return switchItem;
+}
+
+// Creates a CollectionViewTextItem instance.
+- (CollectionViewTextItem*)
+textItemWithItemType:(NSInteger)itemType
+        textStringID:(int)textStringID
+      detailStringID:(int)detailStringID
+       accessoryType:(MDCCollectionViewCellAccessoryType)accessoryType
+           commandID:(NSInteger)commandID {
+  CollectionViewTextItem* textItem =
+      [[CollectionViewTextItem alloc] initWithType:itemType];
+  textItem.text = GetNSString(textStringID);
+  textItem.accessoryType = accessoryType;
+  if (detailStringID)
+    textItem.detailText = GetNSString(detailStringID);
+  textItem.commandID = commandID;
+  return textItem;
+}
+
+// Updates the personalized section according to the user consent.
+- (void)updatePersonalizedSection {
+  BOOL enabled = self.isAuthenticated && !self.isConsentGiven;
+  [self updateSectionWithCollapsibleItem:self.syncPersonalizationItem
+                                   items:self.personalizedItems
+                                 enabled:enabled];
+}
+
+// Updates the non-personalized section according to the user consent.
+- (void)updateNonPersonalizedSection {
+  BOOL enabled = !self.isAuthenticated || !self.isConsentGiven;
+  [self updateSectionWithCollapsibleItem:self.nonPersonalizedServicesItem
+                                   items:self.nonPersonalizedItems
+                                 enabled:enabled];
+}
+
+// Set a section (collapsible item, with all the items inside) to be enabled
+// or disabled.
+- (void)updateSectionWithCollapsibleItem:
+            (SettingsCollapsibleItem*)collapsibleItem
+                                   items:(ItemArray)items
+                                 enabled:(BOOL)enabled {
+  UIColor* textColor = enabled ? nil : [[MDCPalette greyPalette] tint500];
+  collapsibleItem.textColor = textColor;
+  for (CollectionViewItem* item in items) {
+    if ([item isKindOfClass:[SyncSwitchItem class]]) {
+      SyncSwitchItem* switchItem = base::mac::ObjCCast<SyncSwitchItem>(item);
+      switchItem.enabled = enabled;
+    } else if ([item isKindOfClass:[CollectionViewTextItem class]]) {
+      CollectionViewTextItem* textItem =
+          base::mac::ObjCCast<CollectionViewTextItem>(item);
+      textItem.textColor = textColor;
+    } else {
+      NOTREACHED();
+    }
+  }
+}
+
 #pragma mark - GoogleServicesSettingsViewControllerModelDelegate
 
 - (void)googleServicesSettingsViewControllerLoadModel:
@@ -392,8 +447,12 @@ typedef NS_ENUM(NSInteger, ItemType) {
 
 #pragma mark - GoogleServicesSettingsCommandHandler
 
-- (void)toggleSyncEverythingWithValue:(BOOL)on {
-  // Needs to be implemented.
+- (void)toggleSyncEverythingWithValue:(BOOL)value {
+  if (value == self.isConsentGiven)
+    return;
+  // Mark the switch has being animated to avoid being reloaded.
+  base::AutoReset<BOOL> autoReset(&_syncEverythingSwitchBeingAnimated, YES);
+  self.prefService->SetBoolean(kUnifiedConsentGiven, value);
 }
 
 - (void)toggleBookmarksSyncWithValue:(BOOL)on {
@@ -456,4 +515,36 @@ typedef NS_ENUM(NSInteger, ItemType) {
   // Needs to be implemented.
 }
 
+#pragma mark - PrefObserverDelegate
+
+- (void)onPreferenceChanged:(const std::string&)preferenceName {
+  DCHECK_EQ(kUnifiedConsentGiven, preferenceName);
+  self.syncEverythingItem.on = self.isConsentGiven;
+  [self updatePersonalizedSection];
+  [self updateNonPersonalizedSection];
+  CollectionViewModel* model = self.consumer.collectionViewModel;
+  if (!self.isConsentGiven) {
+    // If the consent is removed, both collapsible sections should be expanded.
+    [model setSection:PersonalizedSectionIdentifier collapsed:NO];
+    [self syncPersonalizationItem].collapsed = NO;
+    [model setSection:NonPersonalizedSectionIdentifier collapsed:NO];
+    [self nonPersonalizedServicesItem].collapsed = NO;
+  }
+  // Reload sections.
+  NSMutableIndexSet* sectionIndexToReload = [NSMutableIndexSet indexSet];
+  if (!self.syncEverythingSwitchBeingAnimated) {
+    // The sync everything section can be reloaded only if the switch for
+    // syncEverythingItem is not currently animated. Otherwise the animation
+    // would be stopped before the end.
+    [sectionIndexToReload addIndex:[model sectionForSectionIdentifier:
+                                              SyncEverythingSectionIdentifier]];
+  }
+  [sectionIndexToReload
+      addIndex:[model
+                   sectionForSectionIdentifier:PersonalizedSectionIdentifier]];
+  [sectionIndexToReload addIndex:[model sectionForSectionIdentifier:
+                                            NonPersonalizedSectionIdentifier]];
+  [self.consumer reloadSections:sectionIndexToReload];
+}
+
 @end

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

@@ -166,6 +166,10 @@ constexpr NSInteger kSectionOffset = 1000;
   return cell;
 }
 
+- (void)reloadSections:(NSIndexSet*)sections {
+  [self.collectionView reloadSections:sections];
+}
+
 #pragma mark - CollectionViewController
 
 - (void)loadModel {