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

chrome/browser/signin/signin_tracker.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CHROME_BROWSER_SIGNIN_SIGNIN_TRACKER_H_
 #define CHROME_BROWSER_SIGNIN_SIGNIN_TRACKER_H_
 
 #include "content/public/browser/notification_observer.h"
 #include "content/public/browser/notification_registrar.h"
 #include "content/public/browser/notification_types.h"
@@ skipping 38 matching lines @@
 class SigninTracker : public content::NotificationObserver,
                       public OAuth2TokenService::Observer {
  public:
   class Observer {
    public:
     // The signin attempt failed, and the cause is passed in |error|.
     virtual void SigninFailed(const GoogleServiceAuthError& error) = 0;
 
     // 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
   // |profile|, and notifies the |observer| on status changes. |observer| must
   // be non-null and must outlive the SigninTracker.
   SigninTracker(Profile* profile, Observer* observer);
   virtual ~SigninTracker();
 
   // content::NotificationObserver implementation.
   virtual void Observe(int type,
@@ skipping 14 matching lines @@
   // Weak pointer to the observer we call when the signin state changes.
   Observer* observer_;
 
   // Used to listen to notifications from the SigninManager.
   content::NotificationRegistrar registrar_;
 
   DISALLOW_COPY_AND_ASSIGN(SigninTracker);
 };
 
 #endif  // CHROME_BROWSER_SIGNIN_SIGNIN_TRACKER_H_