Record the number of tabs in a session restore in SampledProfile

chrome/browser/sessions/session_restore_test_helper.cc

 // 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.
 
 #include "chrome/browser/sessions/session_restore_test_helper.h"
 
 #include "content/public/test/test_utils.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 SessionRestoreTestHelper::SessionRestoreTestHelper()
@@ skipping 11 matching lines @@
 void SessionRestoreTestHelper::Wait() {
   if (restore_notification_seen_)
     return;
 
   loop_is_running_ = true;
   message_loop_runner_ = new content::MessageLoopRunner;
   message_loop_runner_->Run();
   EXPECT_TRUE(restore_notification_seen_);
 }
 
-void SessionRestoreTestHelper::OnSessionRestoreDone() {
+void SessionRestoreTestHelper::OnSessionRestoreDone(int /* num_tabs */) {
   restore_notification_seen_ = true;
   if (!loop_is_running_)
     return;
 
   message_loop_runner_->Quit();
   loop_is_running_ = false;
 }