Record the number of tabs in a session restore in SampledProfile

chrome/browser/sessions/session_restore_test_helper.h

 // Copyright 2015 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_SESSIONS_SESSION_RESTORE_TEST_HELPER_H_
 #define CHROME_BROWSER_SESSIONS_SESSION_RESTORE_TEST_HELPER_H_
 
 #include "base/basictypes.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/memory/weak_ptr.h"
 #include "chrome/browser/sessions/session_restore.h"
 
 namespace content {
 class MessageLoopRunner;
 }
 
 // This class waits on the SessionRestore notification. It is a replacement for
 // content::WindowedNotificationObserver, which uses notification service. This
 // class uses the callback-based notification instead.
 class SessionRestoreTestHelper {
  public:
   SessionRestoreTestHelper();
   ~SessionRestoreTestHelper();
 
   // Blocks until OnSessionRestore() is called.
   void Wait();
 
  private:
   // Callback for session restore notifications.
-  void OnSessionRestoreDone();
+  void OnSessionRestoreDone(int /* num_tabs_restored */);
 
   // Indicates whether a session restore notification has been received.
   bool restore_notification_seen_;
 
   // Indicates whether |message_loop_runner_| is running.
   bool loop_is_running_;
 
   // Loop that runs while waiting for notification callback.
   scoped_refptr<content::MessageLoopRunner> message_loop_runner_;
 
   // For automatically unsubscribing from callback-based notifications.
   SessionRestore::CallbackSubscription callback_subscription_;
 
   // For safely binding pointers to callbacks.
   base::WeakPtrFactory<SessionRestoreTestHelper> weak_ptr_factory;
 
   DISALLOW_COPY_AND_ASSIGN(SessionRestoreTestHelper);
 };
 
 #endif  // CHROME_BROWSER_SESSIONS_SESSION_RESTORE_TEST_HELPER_H_