[Merge M57] arc: Provide more logging for network failures.

chrome/browser/chromeos/arc/arc_session_manager.cc

Index: chrome/browser/chromeos/arc/arc_session_manager.cc
diff --git a/chrome/browser/chromeos/arc/arc_session_manager.cc b/chrome/browser/chromeos/arc/arc_session_manager.cc
index 6d26ffc4cf43ea2b4793866e220032ca69cb1145..02f9ac5971287a26fa4604bbc69b2550d567eb3f 100644
--- a/chrome/browser/chromeos/arc/arc_session_manager.cc
+++ b/chrome/browser/chromeos/arc/arc_session_manager.cc
@@ -399,6 +399,10 @@ void ArcSessionManager::OnProvisioningFinished(ProvisioningResult result) {
     case ProvisioningResult::CHROME_SERVER_COMMUNICATION_ERROR:
       error = ArcSupportHost::Error::SERVER_COMMUNICATION_ERROR;
       break;
+    case ProvisioningResult::NO_NETWORK_CONNECTION:
+      // TODO(khmel): Use explicit error for M58+ builds.
+      error = ArcSupportHost::Error::SIGN_IN_SERVICE_UNAVAILABLE_ERROR;
+      break;
     default:
       error = ArcSupportHost::Error::SIGN_IN_UNKNOWN_ERROR;
       break;