Support for auth code based authentication flow for both app and web UI driven flow.

chrome/browser/chromeos/login/oauth2_token_fetcher.h

 // Copyright (c) 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_LOGIN_OAUTH2_TOKEN_FETCHER_H_
 #define CHROME_BROWSER_CHROMEOS_LOGIN_OAUTH2_TOKEN_FETCHER_H_
 
+#include <string>
+
 #include "base/basictypes.h"
 #include "base/callback_forward.h"
 #include "base/compiler_specific.h"
 #include "base/memory/weak_ptr.h"
 #include "google_apis/gaia/gaia_auth_consumer.h"
 #include "google_apis/gaia/gaia_auth_fetcher.h"
 
 namespace net {
 class URLRequestContextGetter;
 }
@@ skipping 11 matching lines @@
     virtual ~Delegate() {}
     virtual void OnOAuth2TokensAvailable(
         const GaiaAuthConsumer::ClientOAuthResult& oauth2_tokens) = 0;
     virtual void OnOAuth2TokensFetchFailed() = 0;
   };
 
   OAuth2TokenFetcher(OAuth2TokenFetcher::Delegate* delegate,
                      net::URLRequestContextGetter* context_getter);
   virtual ~OAuth2TokenFetcher();
 
-  void Start();
+  void StartExchangeFromCookies();
+  void StartExchangeFromAuthCode(const std::string& auth_code);
 
  private:
   // Decides how to proceed on GAIA |error|. If the error looks temporary,
   // retries |task| until max retry count is reached.
   // If retry count runs out, or error condition is unrecoverable, it runs
   // |error_handler|.
   void RetryOnError(const GoogleServiceAuthError& error,
                     const base::Closure& task,
                     const base::Closure& error_handler);
 
   // GaiaAuthConsumer overrides.
   virtual void OnClientOAuthSuccess(
       const GaiaAuthConsumer::ClientOAuthResult& result) OVERRIDE;
   virtual void OnClientOAuthFailure(
       const GoogleServiceAuthError& error) OVERRIDE;
 
   OAuth2TokenFetcher::Delegate* delegate_;
   GaiaAuthConsumer::ClientOAuthResult oauth_tokens_;
   GaiaAuthFetcher auth_fetcher_;
 
   // The retry counter. Increment this only when failure happened.
   int retry_count_;
+  std::string auth_code_;
 
   DISALLOW_COPY_AND_ASSIGN(OAuth2TokenFetcher);
 };
 
 }  // namespace chromeos
 
 #endif  // CHROME_BROWSER_CHROMEOS_LOGIN_OAUTH2_TOKEN_FETCHER_H_