Implement device token fetcher

chrome/browser/net/gaia/token_service.h

 // Copyright (c) 2010 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.
 //
 // The TokenService will supply authentication tokens for any service that
 // needs it, such as sync. Whenever the user logs in, a controller watching
 // the token service is expected to call ClientLogin to derive a new SID and
 // LSID. Whenever such credentials are available, the TokenService should be
 // updated with new credentials. The controller should then start fetching
 // tokens, which will be written to the database after retrieval, as well as
@@ skipping 155 matching lines @@
   scoped_refptr<URLRequestContextGetter> getter_;
   // Request handle to load Gaia tokens from DB.
   WebDataService::Handle token_loading_query_;
 
   // Gaia request source for Gaia accounting.
   std::string source_;
   // Credentials from ClientLogin for Issuing auth tokens.
   GaiaAuthConsumer::ClientLoginResult credentials_;
 
   // Size of array of services (must be defined here).
-  static const int kNumServices = 2;
+  static const int kNumServices = 3;
   // List of services that we're performing operations for.
   static const char* kServices[kNumServices];
   // A bunch of fetchers suitable for token issuing. We don't care about
   // the ordering, nor do we care which is for which service.
   scoped_ptr<GaiaAuthenticator2> fetchers_[kNumServices];
   // Map from service to token.
   std::map<std::string, std::string> token_map_;
 
   NotificationRegistrar registrar_;
 
   FRIEND_TEST_ALL_PREFIXES(TokenServiceTest, LoadTokensIntoMemoryBasic);
   FRIEND_TEST_ALL_PREFIXES(TokenServiceTest, LoadTokensIntoMemoryAdvanced);
 
   DISALLOW_COPY_AND_ASSIGN(TokenService);
 };
 
 #endif  // CHROME_BROWSER_NET_GAIA_TOKEN_SERVICE_H_