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

google_apis/gaia/gaia_urls.h

Index: google_apis/gaia/gaia_urls.h
diff --git a/google_apis/gaia/gaia_urls.h b/google_apis/gaia/gaia_urls.h
index 70919ab9cd35df1f630e2a5899e63f0b02cfe9d9..55080d9394d74b1c4ce06c662d3fb2bbdd4189b6 100644
--- a/google_apis/gaia/gaia_urls.h
+++ b/google_apis/gaia/gaia_urls.h
@@ -32,10 +32,8 @@ class GaiaUrls {
   const GURL& oauth_user_info_url() const;
   const GURL& oauth_revoke_token_url() const;
   const GURL& oauth1_login_url() const;
-  const GURL& list_accounts_url() const;
   const GURL& embedded_signin_url() const;
   const GURL& add_account_url() const;
-  const GURL& get_check_connection_info_url() const;
 
   const std::string& oauth2_chrome_client_id() const;
   const std::string& oauth2_chrome_client_secret() const;
@@ -48,6 +46,9 @@ class GaiaUrls {
 
   const GURL& gaia_login_form_realm() const;
 
+  GURL ListAccountsURLWithSource(const std::string& source);
+  GURL GetCheckConnectionInfoURLWithSource(const std::string& source);
+
  private:
   GaiaUrls();
   ~GaiaUrls();