Create system tray item for accessing chrome://slow

ash/system/tray/test_system_tray_delegate.cc

 // 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.
 
 #include "ash/system/tray/test_system_tray_delegate.h"
 
 #include <string>
 
 #include "ash/session_state_delegate.h"
 #include "ash/shell.h"
@@ skipping 109 matching lines @@
 void TestSystemTrayDelegate::ShowNetworkSettings(
     const std::string& service_path) {
 }
 
 void TestSystemTrayDelegate::ShowBluetoothSettings() {
 }
 
 void TestSystemTrayDelegate::ShowDisplaySettings() {
 }
 
+void TestSystemTrayDelegate::ShowSlow() {
+}
+
 bool TestSystemTrayDelegate::ShouldShowDisplayNotification() {
   return should_show_display_notification_;
 }
 
 void TestSystemTrayDelegate::ShowDriveSettings() {
 }
 
 void TestSystemTrayDelegate::ShowIMESettings() {
 }
 
@@ skipping 146 matching lines @@
 base::string16 TestSystemTrayDelegate::FormatTimeDuration(
     const base::TimeDelta& delta) const {
   return base::string16();
 }
 
 void TestSystemTrayDelegate::MaybeSpeak(const std::string& utterance) const {
 }
 
 }  // namespace test
 }  // namespace ash