Initialize the message center as part of the testing browser process

ash/test/ash_interactive_ui_test_base.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 "ash/test/ash_interactive_ui_test_base.h"
 
 #include "base/path_service.h"
 #include "ui/aura/env.h"
 #include "ui/base/resource/resource_bundle.h"
 #include "ui/base/ui_base_paths.h"
 #include "ui/gl/test/gl_surface_test_support.h"
+#include "ui/message_center/message_center.h"
 
 namespace ash {
 namespace test {
 
 AshInteractiveUITestBase::AshInteractiveUITestBase() {}
 
 AshInteractiveUITestBase::~AshInteractiveUITestBase() {}
 
 void AshInteractiveUITestBase::SetUp() {
   gl::GLSurfaceTestSupport::InitializeOneOff();
 
   ui::RegisterPathProvider();
   ui::ResourceBundle::InitSharedInstanceWithLocale(
       "en-US", NULL, ui::ResourceBundle::LOAD_COMMON_RESOURCES);
   base::FilePath resources_pack_path;
   PathService::Get(base::DIR_MODULE, &resources_pack_path);
   resources_pack_path =
       resources_pack_path.Append(FILE_PATH_LITERAL("resources.pak"));
   ResourceBundle::GetSharedInstance().AddDataPackFromPath(
       resources_pack_path, ui::SCALE_FACTOR_NONE);
   env_ = aura::Env::CreateInstance();
-
+  message_center::MessageCenter::Initialize();
   test::AshTestBase::SetUp();
 }
 
 void AshInteractiveUITestBase::TearDown() {
   test::AshTestBase::TearDown();
+  message_center::MessageCenter::Shutdown();
   env_.reset();
 }
 
 }  // namespace test
 }  // namespace ash