Let Ubertoken Fetch be primed with an access token.

components/signin/core/browser/gaia_cookie_manager_service.h

Index: components/signin/core/browser/gaia_cookie_manager_service.h
diff --git a/components/signin/core/browser/gaia_cookie_manager_service.h b/components/signin/core/browser/gaia_cookie_manager_service.h
index d5b6c51fcfd9e7bd0275b348500cbf99003b77ef..c28c8d937c7844d98e0f16db7653ea606e5db7b8 100644
--- a/components/signin/core/browser/gaia_cookie_manager_service.h
+++ b/components/signin/core/browser/gaia_cookie_manager_service.h
@@ -160,6 +160,8 @@ class GaiaCookieManagerService : public KeyedService,
   void Shutdown() override;
 
   void AddAccountToCookie(const std::string& account_id);
+  void AddAccountToCookieWithToken(const std::string& account_id,
+                                   const std::string& oauth2_token);
 
   // Returns if the listed accounts are up to date or not (ignore the out
   // parameter if return is false). The parameter will be assigned the current
@@ -216,7 +218,7 @@ class GaiaCookieManagerService : public KeyedService,
 
   // Starts the proess of fetching the uber token and performing a merge session
   // for the next account.  Virtual so that it can be overriden in tests.
-  virtual void StartFetchingUbertoken();
+  virtual void StartFetchingUbertoken(const std::string& access_token);
 
   // Virtual for testing purposes.
   virtual void StartFetchingMergeSession();