[iOS] Allow switching between sign-in notification infobar titles.

Use kSigninNotificationInfobarUsernameInTitle experimental flag to allow
switching between "Signed in as [username]" and "Signed in to Chrome"
titles in the sign-in notification infobar.

Bug: 1145592
Change-Id: I31a7b98137f1006f826ff18ee3168d9f87b65431
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2526420Reviewed-by: Jérôme Lebel <jlebel@chromium.org>
Commit-Queue: Nohemi Fernandez <fernandex@chromium.org>
Cr-Commit-Position: refs/heads/master@{#825342}

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

@@ -33,6 +33,7 @@ source_set("authentication") {
     "//components/consent_auditor",
     "//components/infobars/core",
     "//components/prefs",
+    "//components/signin/ios/browser",
     "//components/signin/public/base",
     "//components/signin/public/identity_manager",
     "//components/signin/public/identity_manager/objc",

ios/chrome/browser/ui/authentication/signin_notification_infobar_delegate.h

@@ -5,7 +5,6 @@
 #ifndef IOS_CHROME_BROWSER_UI_AUTHENTICATION_SIGNIN_NOTIFICATION_INFOBAR_DELEGATE_H_
 #define IOS_CHROME_BROWSER_UI_AUTHENTICATION_SIGNIN_NOTIFICATION_INFOBAR_DELEGATE_H_
 
-#import <UIKit/UIKit.h>
 #include <memory>
 
 #include "base/macros.h"
@@ -17,6 +16,7 @@
 
 @protocol ApplicationSettingsCommands;
 class ChromeBrowserState;
+@class UIViewController;
 
 namespace gfx {
 class Image;

ios/chrome/browser/ui/authentication/signin_notification_infobar_delegate.mm

@@ -15,6 +15,7 @@
 #include "components/infobars/core/infobar.h"
 #include "components/infobars/core/infobar_delegate.h"
 #include "components/infobars/core/infobar_manager.h"
+#include "components/signin/ios/browser/features.h"
 #import "ios/chrome/browser/browser_state/chrome_browser_state.h"
 #include "ios/chrome/browser/infobars/infobar_utils.h"
 #import "ios/chrome/browser/main/browser.h"
@@ -74,9 +75,17 @@ SigninNotificationInfoBarDelegate::SigninNotificationInfoBarDelegate(
     image = [UIImage imageNamed:@"ios_default_avatar"];
   }
   icon_ = gfx::Image(CircularImageFromImage(image, kAvatarImageDimension));
+
+  if (base::FeatureList::IsEnabled(
+          signin::kSigninNotificationInfobarUsernameInTitle)) {
     message_ = base::SysNSStringToUTF16(l10n_util::GetNSStringF(
         IDS_IOS_SIGNIN_ACCOUNT_NOTIFICATION_TITLE_WITH_USERNAME,
         base::SysNSStringToUTF16(identity.userFullName)));
+  } else {
+    message_ = base::SysNSStringToUTF16(
+        l10n_util::GetNSString(IDS_IOS_SIGNIN_ACCOUNT_NOTIFICATION_TITLE));
+  }
+
   button_text_ =
       base::SysNSStringToUTF16(l10n_util::GetNSString(IDS_IOS_SETTINGS_TITLE));
 }