[sync] Auto-create credential cache for users who are already signed in and go on to upgrade Chrome

chrome/browser/signin/token_service.h

Index: chrome/browser/signin/token_service.h
diff --git a/chrome/browser/signin/token_service.h b/chrome/browser/signin/token_service.h
index ea7bd6e18b77cc2b61ec7a8b2c4000123a317e2b..084b753d86aa7ea8be355318966c5055c41e7ca1 100644
--- a/chrome/browser/signin/token_service.h
+++ b/chrome/browser/signin/token_service.h
@@ -177,6 +177,10 @@ class TokenService : public GaiaAuthConsumer,
   void IssueAuthTokenForTest(const std::string& service,
                              const std::string& auth_token);
 
+  const GaiaAuthConsumer::ClientLoginResult& credentials() const {
+    return credentials_;
+  }
+
   // GaiaAuthConsumer implementation.
   virtual void OnIssueAuthTokenSuccess(const std::string& service,
                                        const std::string& auth_token) OVERRIDE;