Add countdown when session time is limited

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/shell.h"
 #include "ash/shell_delegate.h"
@@ skipping 285 matching lines @@
 VolumeControlDelegate* TestSystemTrayDelegate::GetVolumeControlDelegate()
     const {
   return volume_control_delegate_.get();
 }
 
 void TestSystemTrayDelegate::SetVolumeControlDelegate(
     scoped_ptr<VolumeControlDelegate> delegate) {
   volume_control_delegate_ = delegate.Pass();
 }
 
+base::Time TestSystemTrayDelegate::GetSessionStartTime() {
+  return base::Time();
+}
+
+base::TimeDelta TestSystemTrayDelegate::GetSessionLengthLimit() {
+  return base::TimeDelta();
+}
+
 }  // namespace test
 }  // namespace ash