Record the number of tabs in a session restore in SampledProfile

chrome/browser/extensions/state_store_notification_observer.h

 // Copyright 2014 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_EXTENSIONS_STATE_STORE_NOTIFICATION_OBSERVER_H_
 #define CHROME_BROWSER_EXTENSIONS_STATE_STORE_NOTIFICATION_OBSERVER_H_
 
 #include "base/compiler_specific.h"
 #include "base/macros.h"
 #include "chrome/browser/sessions/session_restore.h"
 
 namespace extensions {
 class StateStore;
 
 // Initializes the StateStore when session restore is complete, for example when
 // page load notifications are not sent ("Continue where I left off").
 // http://crbug.com/230481
 class StateStoreNotificationObserver {
  public:
   explicit StateStoreNotificationObserver(StateStore* state_store);
   ~StateStoreNotificationObserver();
 
  private:
   // Called when a session restore has finished.
-  void OnSessionRestoreDone();
+  void OnSessionRestoreDone(int num_tabs_restored);
 
   StateStore* state_store_;  // Not owned.
 
   // Points to the on-session-restored callback that was registered with
   // SessionRestore's callback list. When objects of this class are destroyed,
   // the subscription object's destructor will automatically unregister the
   // callback in SessionRestore, so that the callback list does not contain any
   // obsolete callbacks.
   SessionRestore::CallbackSubscription
       on_session_restored_callback_subscription_;
 
   DISALLOW_COPY_AND_ASSIGN(StateStoreNotificationObserver);
 };
 
 }  // namespace extensions
 
 #endif  // CHROME_BROWSER_EXTENSIONS_STATE_STORE_NOTIFICATION_OBSERVER_H_