Use a distinct source parameter on gaia endpoints for the reconcilor.

google_apis/gaia/merge_session_helper.h

 // Copyright 2014 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 GOOGLE_APIS_GAIA_MERGE_SESSION_HELPER_H_
 #define GOOGLE_APIS_GAIA_MERGE_SESSION_HELPER_H_
 
 #include <deque>
 
 #include "base/observer_list.h"
@@ skipping 85 matching lines @@
     MergeSessionHelper* helper_;
     base::OneShotTimer<ExternalCcResultFetcher> timer_;
     scoped_ptr<GaiaAuthFetcher> gaia_auth_fetcher_;
     URLToTokenAndFetcher fetchers_;
     ResultMap results_;
 
     DISALLOW_COPY_AND_ASSIGN(ExternalCcResultFetcher);
   };
 
   MergeSessionHelper(OAuth2TokenService* token_service,
+                     const std::string& source,
                      net::URLRequestContextGetter* request_context,
                      Observer* observer);
   virtual ~MergeSessionHelper();
 
   void LogIn(const std::string& account_id);
 
   // Add or remove observers of this helper.
   void AddObserver(Observer* observer);
   void RemoveObserver(Observer* observer);
 
@@ skipping 63 matching lines @@
 
   // A worklist for this class. Accounts names are stored here if
   // we are pending a signin action for that account. Empty strings
   // represent a signout request.
   std::deque<std::string> accounts_;
 
   // List of observers to notify when merge session completes.
   // Makes sure list is empty on destruction.
   ObserverList<Observer, true> observer_list_;
 
+  // Source to use with GAIA endpoints for accounting.
+  std::string source_;
+
   DISALLOW_COPY_AND_ASSIGN(MergeSessionHelper);
 };
 
 #endif  // GOOGLE_APIS_GAIA_MERGE_SESSION_HELPER_H_