Enabled SignInAfterInit test.

chrome/browser/signin/token_service.h

 // Copyright (c) 2012 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 either to call ClientLogin to derive a new
 // SID and LSID, or to use GAIA OAuth requests to derive an OAuth1 access
 // token for the OAuthLogin scope.  Whenever such credentials are available,
 // the TokenService should be updated with new credentials.  The controller
@@ skipping 13 matching lines @@
 //   SetMyToken(token_service.GetTokenForService(servicename));
 // }
 // RegisterSomeObserver(token_service);
 //
 // Whenever a token update occurs:
 // OnTokenAvailable(...) {
 //   if (IsServiceICareAbout(notification.service())) {
 //     SetMyToken(notification.token())
 //   }
 // }
+//
+// There is currently no easy way to create a fake TokenService. Tests that want
+// to use TokenService to issue tokens without the use of fake GaiaAuthFetchers
+// or persisting the tokens to disk via WebDataService can do this by
+// creating a TokenService (skipping the Initialize() step to avoid interacting
+// with WebDataService) and calling IssueAuthTokenForTest() to issue new tokens.
+// This will result in the TokenService sending out the appropriate
+// TOKEN_AVAILABLE notification and returning the correct response to future
+// calls to Has/GetTokenForService().
 
 #ifndef CHROME_BROWSER_SIGNIN_TOKEN_SERVICE_H_
 #define CHROME_BROWSER_SIGNIN_TOKEN_SERVICE_H_
 
 #include <map>
 #include <string>
 #include <vector>
 
 #include "base/gtest_prod_util.h"
 #include "base/memory/scoped_ptr.h"
@@ skipping 204 matching lines @@
 
   friend class TokenServiceTest;
   FRIEND_TEST_ALL_PREFIXES(TokenServiceTest, LoadTokensIntoMemoryBasic);
   FRIEND_TEST_ALL_PREFIXES(TokenServiceTest, LoadTokensIntoMemoryAdvanced);
   FRIEND_TEST_ALL_PREFIXES(TokenServiceTest, FullIntegrationNewServicesAdded);
 
   DISALLOW_COPY_AND_ASSIGN(TokenService);
 };
 
 #endif  // CHROME_BROWSER_SIGNIN_TOKEN_SERVICE_H_