[iOS] Adding implementation for Passphrase dialog in Manage Sync settings

Opens the sync encryption dialog when the user taps on the "Encryption"
item.

Bug: 914059
Change-Id: I5a750107f2594e64c4d81e468a47c8a7607e5286
Reviewed-on: https://chromium-review.googlesource.com/c/1477237
Commit-Queue: Jérôme Lebel <jlebel@chromium.org>
Reviewed-by: Gauthier Ambard <gambard@chromium.org>
Cr-Commit-Position: refs/heads/master@{#635144}

ios/chrome/browser/ui/settings/google_services/manage_sync_settings_coordinator.mm

@@ -5,11 +5,14 @@
 #import "ios/chrome/browser/ui/settings/google_services/manage_sync_settings_coordinator.h"
 
 #include "base/logging.h"
+#include "components/browser_sync/profile_sync_service.h"
 #include "ios/chrome/browser/sync/profile_sync_service_factory.h"
 #include "ios/chrome/browser/sync/sync_setup_service_factory.h"
 #import "ios/chrome/browser/ui/settings/google_services/manage_sync_settings_command_handler.h"
 #import "ios/chrome/browser/ui/settings/google_services/manage_sync_settings_mediator.h"
 #import "ios/chrome/browser/ui/settings/google_services/manage_sync_settings_table_view_controller.h"
+#import "ios/chrome/browser/ui/settings/sync/sync_encryption_passphrase_table_view_controller.h"
+#import "ios/chrome/browser/ui/settings/sync/sync_encryption_table_view_controller.h"
 
 #if !defined(__has_feature) || !__has_feature(objc_arc)
 #error "This file requires ARC support."
@@ -60,6 +63,21 @@
 #pragma mark - ManageSyncSettingsCommandHandler
 
 - (void)openPassphraseDialog {
+  DCHECK(self.mediator.shouldEncryptionItemBeEnabled);
+  syncer::SyncService* syncService =
+      ProfileSyncServiceFactory::GetForBrowserState(self.browserState);
+  UIViewController<SettingsRootViewControlling>* controllerToPush;
+  // If there was a sync error, prompt the user to enter the passphrase.
+  // Otherwise, show the full encryption options.
+  if (syncService->GetUserSettings()->IsPassphraseRequired()) {
+    controllerToPush = [[SyncEncryptionPassphraseTableViewController alloc]
+        initWithBrowserState:self.browserState];
+  } else {
+    controllerToPush = [[SyncEncryptionTableViewController alloc]
+        initWithBrowserState:self.browserState];
+  }
+  controllerToPush.dispatcher = self.dispatcher;
+  [self.navigationController pushViewController:controllerToPush animated:YES];
 }
 
 - (void)openWebAppActivityDialog {

ios/chrome/browser/ui/settings/google_services/manage_sync_settings_mediator.h

@@ -28,6 +28,8 @@ class SyncService;
 @property(nonatomic, assign) SyncSetupService* syncSetupService;
 // Command handler.
 @property(nonatomic, weak) id<ManageSyncSettingsCommandHandler> commandHandler;
+// Returns YES if the encryption item should be enabled.
+@property(nonatomic, assign, readonly) BOOL shouldEncryptionItemBeEnabled;
 
 // Designated initializer.
 // |syncService|: Sync service. Should not be null.

ios/chrome/browser/ui/settings/google_services/manage_sync_settings_mediator.mm

@@ -220,13 +220,9 @@ NSString* kGoogleServicesSyncErrorImage = @"google_services_sync_error";
 // Updates encryption item, and notifies the consumer if |notifyConsumer| is set
 // to YES.
 - (void)updateEncryptionItem:(BOOL)notifyConsumer {
-  BOOL shouldEncryptionItemBeEnabled =
-      self.syncService->IsEngineInitialized() &&
-      self.syncSetupService->IsSyncEnabled() &&
-      !self.disabledBecauseOfSyncError;
   BOOL needsUpdate =
-      shouldEncryptionItemBeEnabled &&
-      (self.encryptionItem.enabled != shouldEncryptionItemBeEnabled);
+      self.shouldEncryptionItemBeEnabled &&
+      (self.encryptionItem.enabled != self.shouldEncryptionItemBeEnabled);
   if (self.syncSetupService->GetSyncServiceState() ==
       SyncSetupService::kSyncServiceNeedsPassphrase) {
     needsUpdate = needsUpdate || self.encryptionItem.image == nil;
@@ -239,8 +235,8 @@ NSString* kGoogleServicesSyncErrorImage = @"google_services_sync_error";
     self.encryptionItem.image = nil;
     self.encryptionItem.detailText = nil;
   }
-  self.encryptionItem.enabled = shouldEncryptionItemBeEnabled;
-  if (shouldEncryptionItemBeEnabled) {
+  self.encryptionItem.enabled = self.shouldEncryptionItemBeEnabled;
+  if (self.shouldEncryptionItemBeEnabled) {
     self.encryptionItem.textColor = nil;
   } else {
     self.encryptionItem.textColor =
@@ -308,6 +304,12 @@ NSString* kGoogleServicesSyncErrorImage = @"google_services_sync_error";
          state != SyncSetupService::kSyncServiceNeedsPassphrase;
 }
 
+- (BOOL)shouldEncryptionItemBeEnabled {
+  return self.syncService->IsEngineInitialized() &&
+         self.syncSetupService->IsSyncEnabled() &&
+         !self.disabledBecauseOfSyncError;
+}
+
 #pragma mark - ManageSyncSettingsTableViewControllerModelDelegate
 
 - (void)manageSyncSettingsTableViewControllerLoadModel: