Do not announce robot account token before account ID is available

chrome/browser/chromeos/settings/device_oauth2_token_service.h

 // Copyright 2013 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.
 
 #ifndef CHROME_BROWSER_CHROMEOS_SETTINGS_DEVICE_OAUTH2_TOKEN_SERVICE_H_
 #define CHROME_BROWSER_CHROMEOS_SETTINGS_DEVICE_OAUTH2_TOKEN_SERVICE_H_
 
 #include <string>
 #include <vector>
 
 #include "base/basictypes.h"
 #include "base/callback.h"
 #include "base/gtest_prod_util.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/memory/weak_ptr.h"
 #include "base/stl_util.h"
 #include "base/time/time.h"
+#include "chrome/browser/chromeos/settings/cros_settings.h"
 #include "google_apis/gaia/gaia_oauth_client.h"
 #include "google_apis/gaia/oauth2_token_service.h"
 #include "net/url_request/url_request_context_getter.h"
 
 namespace gaia {
 class GaiaOAuthClient;
 }
 
 namespace net {
 class URLRequestContextGetter;
@@ skipping 69 matching lines @@
     // System salt loaded, validation not started yet.
     STATE_VALIDATION_PENDING,
     // Refresh token validation underway.
     STATE_VALIDATION_STARTED,
     // Token validation failed.
     STATE_TOKEN_INVALID,
     // Refresh token is valid.
     STATE_TOKEN_VALID,
   };
 
+  // Invoked by CrosSettings when the robot account ID becomes available.
+  void OnServiceAccountIdentityChanged();
+
   // Use DeviceOAuth2TokenServiceFactory to get an instance of this class.
   // Ownership of |token_encryptor| will be taken.
   explicit DeviceOAuth2TokenService(net::URLRequestContextGetter* getter,
                                     PrefService* local_state);
   ~DeviceOAuth2TokenService() override;
 
   // Returns the refresh token for account_id.
   std::string GetRefreshToken(const std::string& account_id) const;
 
   // Handles completion of the system salt input.
@@ skipping 37 matching lines @@
   // The system salt for encrypting and decrypting the refresh token.
   std::string system_salt_;
 
   int max_refresh_token_validation_retries_;
 
   // Cache the decrypted refresh token, so we only decrypt once.
   std::string refresh_token_;
 
   scoped_ptr<gaia::GaiaOAuthClient> gaia_oauth_client_;
 
+  scoped_ptr<CrosSettings::ObserverSubscription>
+      service_account_identity_subscription_;
+
   base::WeakPtrFactory<DeviceOAuth2TokenService> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(DeviceOAuth2TokenService);
 };
 
 }  // namespace chromeos
 
 #endif  // CHROME_BROWSER_CHROMEOS_SETTINGS_DEVICE_OAUTH2_TOKEN_SERVICE_H_