arc: Use AndroidKioskAppInfoProto.display_name() as ARC++ Kiosk app name.

chrome/browser/chromeos/policy/device_policy_decoder_chromeos.cc

Index: chrome/browser/chromeos/policy/device_policy_decoder_chromeos.cc
diff --git a/chrome/browser/chromeos/policy/device_policy_decoder_chromeos.cc b/chrome/browser/chromeos/policy/device_policy_decoder_chromeos.cc
index 7e1dc1e42ca2fd867858df6c44cdee83aa158420..201b08de9ae85c434315aaa1f5c668abb26ba6e9 100644
--- a/chrome/browser/chromeos/policy/device_policy_decoder_chromeos.cc
+++ b/chrome/browser/chromeos/policy/device_policy_decoder_chromeos.cc
@@ -221,6 +221,11 @@ void DecodeLoginPolicies(const em::ChromeDeviceSettingsProto& policy,
               chromeos::kAccountsPrefDeviceLocalAccountsKeyArcKioskAction,
               entry.android_kiosk_app().action());
         }
+        if (entry.android_kiosk_app().has_display_name()) {
+          entry_dict->SetStringWithoutPathExpansion(
+              chromeos::kAccountsPrefDeviceLocalAccountsKeyArcKioskDisplayName,
+              entry.android_kiosk_app().display_name());
+        }
       } else if (entry.has_deprecated_public_session_id()) {
         // Deprecated public session specification.
         entry_dict->SetStringWithoutPathExpansion(