[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 a4106d63cde735e2a9d7b2880e2b92e33c13adc2..98cc65e3fae51ac5a8360718b34cc6287a1560ba 100644
--- a/chrome/browser/signin/token_service.h
+++ b/chrome/browser/signin/token_service.h
@@ -168,6 +168,10 @@ class TokenService : public GaiaAuthConsumer,
   void IssueAuthTokenForTest(const std::string& service,
                              const std::string& auth_token);
 
+  GaiaAuthConsumer::ClientLoginResult credentials() const {
+    return credentials_;
+  }
+
   // GaiaAuthConsumer implementation.
   virtual void OnIssueAuthTokenSuccess(const std::string& service,
                                        const std::string& auth_token) OVERRIDE;