Record the number of tabs in a session restore in SampledProfile

chrome/browser/sessions/session_restore.h

Index: chrome/browser/sessions/session_restore.h
diff --git a/chrome/browser/sessions/session_restore.h b/chrome/browser/sessions/session_restore.h
index f756f10a0e6ae9940f161e5a749bd4630f71a451..9d90d314d8f2a69621a889754fac6ac7b314b447 100644
--- a/chrome/browser/sessions/session_restore.h
+++ b/chrome/browser/sessions/session_restore.h
@@ -40,12 +40,12 @@ class SessionRestore {
   };
 
   // Notification callback list.
-  using CallbackList = base::CallbackList<void(void)>;
+  using CallbackList = base::CallbackList<void(int)>;
 
   // Used by objects calling RegisterOnSessionRestoredCallback() to de-register
   // themselves when they are destroyed.
   using CallbackSubscription =
-      scoped_ptr<base::CallbackList<void(void)>::Subscription>;
+      scoped_ptr<base::CallbackList<void(int)>::Subscription>;
 
   // Restores the last session. |behavior| is a bitmask of Behaviors, see it
   // for details. If |browser| is non-null the tabs for the first window are
@@ -94,7 +94,7 @@ class SessionRestore {
   // Register callbacks for session restore events. These callbacks are stored
   // in on_session_restored_callbacks_.

[sky, 2015/02/04 21:22:11]

You need to document what the int means.

[Simon Que, 2015/02/05 00:16:01]

Done.

   static CallbackSubscription RegisterOnSessionRestoredCallback(
-      const base::Closure& callback);
+      const base::Callback<void(int)>& callback);
 
   // The max number of non-selected tabs SessionRestore loads when restoring
   // a session. A value of 0 indicates all tabs are loaded at once.