Delay loading the NTP after sign in until MergeSession has been performed in

chrome/browser/signin/signin_tracker.h

Index: chrome/browser/signin/signin_tracker.h
diff --git a/chrome/browser/signin/signin_tracker.h b/chrome/browser/signin/signin_tracker.h
index 390a945f3a79ecaaee8ec3f3ac482da2c2f01692..0a6f1ba6e4f547994633c34ccf31f38af48f18a2 100644
--- a/chrome/browser/signin/signin_tracker.h
+++ b/chrome/browser/signin/signin_tracker.h
@@ -56,6 +56,10 @@ class SigninTracker : public content::NotificationObserver,
 
     // The signin attempt succeeded.
     virtual void SigninSuccess() = 0;
+
+    // The signed in account has been merged into the content area cookie jar.
+    // This will be called only after a call to SigninSuccess().
+    virtual void MergeSessionComplete(const GoogleServiceAuthError& error) = 0;
   };
 
   // Creates a SigninTracker that tracks the signin status on the passed