arc: Provide more logging for network failures.

components/arc/common/auth.mojom

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-// Next MinVersion: 8
+// Next MinVersion: 9
 
 module arc.mojom;
 
 // These values describe failure reason of sign-in.
 [Extensible]
 enum ArcSignInFailureReason {
   // Negative values are reserved for internal use.
   // The values are shuffled to keep the backward compatibility and don't match
   // ProvisioningResult in arc_optin_uma.h
-  // Next value: 15.
+  // Next value: 16.
   UNKNOWN_ERROR = 0,
 
   // Mojo errors:
   // MOJO_VERSION_MISMATCH: is sent when an API is not supported
   //   due to Host/Instance version mismatch.
   // MOJO_CALL_TIMEOUT: is sent when a Mojo invocation is started
   //   but not completed with time out.
   MOJO_VERSION_MISMATCH = 6,
   MOJO_CALL_TIMEOUT = 7,
 
@@ skipping 28 matching lines @@
   GMS_SERVICE_UNAVAILABLE = 2,
   GMS_BAD_AUTHENTICATION = 3,
   GMS_SIGN_IN_FAILED = 10,
   GMS_SIGN_IN_TIMEOUT = 11,
   GMS_SIGN_IN_INTERNAL_ERROR = 12,
 
   // Cloud provisioning errors.
   CLOUD_PROVISION_FLOW_FAILED = 5,
   CLOUD_PROVISION_FLOW_TIMEOUT = 13,
   CLOUD_PROVISION_FLOW_INTERNAL_ERROR = 14,
+
+  // Network connection is unavailable.
+  [MinVersion=8] NO_NETWORK_CONNECTION = 15,
 };
 
 // These values describe the type of the Chrome account to provision.
 [Extensible]
 enum ChromeAccountType {
   // Next value: 4
   UNKNOWN = 0,
 
   // Chrome login account type is a user account.
   USER_ACCOUNT = 1,
@@ skipping 77 matching lines @@
   Init@0(AuthHost host_ptr);
 
   // Callback from RequestAccountInfo. This cannot be a normal callback since
   // the result can sometimes take a few minutes in some cases (Kiosk mode),
   // and in other cases there is a UI that the user is shown and they can take
   // an arbitrarily long amount of time to interact with.
   // If |account_info| is null, it implies that there was an error in the
   // process.
   [MinVersion=5] OnAccountInfoReady(AccountInfo? account_info);
 };