Add ManagedUserTokenFetcher to fetch scoped-down tokens.

chrome/browser/signin/oauth2_token_service.h

 // Copyright 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.
 
 #ifndef CHROME_BROWSER_SIGNIN_OAUTH2_TOKEN_SERVICE_H_
 #define CHROME_BROWSER_SIGNIN_OAUTH2_TOKEN_SERVICE_H_
 
 #include <map>
 #include <set>
 #include <string>
@@ skipping 63 matching lines @@
 
   // A set of scopes in OAuth2 authentication.
   typedef std::set<std::string> ScopeSet;
 
   explicit OAuth2TokenService(net::URLRequestContextGetter* getter);
   virtual ~OAuth2TokenService();
 
   // Checks in the cache for a valid access token, and if not found starts
   // a request for an OAuth2 access token using the OAuth2 refresh token
   // maintained by this instance. The caller owns the returned Request.
-  // |scopes| is the set of scopes to get an access token for, |consumer| is
-  // the object that will be called back with results if the returned request
-  // is not deleted.
+  // |scopes| is the set of scopes to get an access token for. If the set is
+  // empty, the returned access token will have the same scope as the refresh
+  // token.
+  // |consumer| is the object that will be called back with results if the
+  // returned request is not deleted.
   virtual scoped_ptr<Request> StartRequest(const ScopeSet& scopes,
                                            Consumer* consumer);
 
   // Returns true if a refresh token exists. If false, calls to
   // |StartRequest| will result in a Consumer::OnGetTokenFailure callback.
   bool RefreshTokenIsAvailable();
 
   // Mark an OAuth2 access token as invalid. This should be done if the token
   // was received from this class, but was not accepted by the server (e.g.,
   // the server returned 401 Unauthorized). The token will be removed from the
@@ skipping 44 matching lines @@
     // Informs |consumer_| that this request is completed.
     void InformConsumer(const GoogleServiceAuthError& error,
                         const std::string& access_token,
                         const base::Time& expiration_date);
 
    private:
     // |consumer_| to call back when this request completes.
     Consumer* const consumer_;
   };
 
-  // Informs the consumer of |request| fetch results.
-  static void InformConsumer(base::WeakPtr<RequestImpl> request,
-                             const GoogleServiceAuthError& error,
-                             const std::string& access_token,
-                             const base::Time& expiration_date);
-
  private:
   // Class that fetches an OAuth2 access token for a given set of scopes and
   // OAuth2 refresh token.
   class Fetcher;
   friend class Fetcher;
 
   // Struct that contains the information of an OAuth2 access token.
   struct CacheEntry {
     std::string access_token;
     base::Time expiration_date;
@@ skipping 26 matching lines @@
   // token.
   typedef std::pair<std::string, ScopeSet> FetchParameters;
   // A map from fetch parameters to a fetcher that is fetching an OAuth2 access
   // token using these parameters.
   std::map<FetchParameters, Fetcher*> pending_fetchers_;
 
   DISALLOW_COPY_AND_ASSIGN(OAuth2TokenService);
 };
 
 #endif  // CHROME_BROWSER_SIGNIN_OAUTH2_TOKEN_SERVICE_H_