Create MetroViewerProcessHost as a common base for TestMetroViewerProcessHost and ChromeMetroViewer…

ash/test/ash_test_base.h

 // 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.
 
 #ifndef ASH_TEST_ASH_TEST_BASE_H_
 #define ASH_TEST_ASH_TEST_BASE_H_
 
 #include <string>
 
 #include "base/compiler_specific.h"
 #include "base/message_loop.h"
+#include "base/threading/thread.h"
 #include "testing/gtest/include/gtest/gtest.h"
 #include "third_party/skia/include/core/SkColor.h"
 #include "ui/aura/client/window_types.h"
 #include "ui/views/test/test_views_delegate.h"
 
 #if defined(OS_WIN)
 #include "ui/base/win/scoped_ole_initializer.h"
 #endif
 
 namespace aura {
@@ skipping 80 matching lines @@
   void SetUserLoggedIn(bool user_logged_in);
   void SetCanLockScreen(bool can_lock_screen);
 
  private:
   bool setup_called_;
   bool teardown_called_;
   base::MessageLoopForUI message_loop_;
   scoped_ptr<AshTestHelper> ash_test_helper_;
   scoped_ptr<aura::test::EventGenerator> event_generator_;
 #if defined(OS_WIN)
+  // Note that the order is important here as ipc_thread_ should be destroyed
+  // after metro_viewer_host_->channel_.
+  scoped_ptr<base::Thread> ipc_thread_;
   scoped_ptr<TestMetroViewerProcessHost> metro_viewer_host_;
   ui::ScopedOleInitializer ole_initializer_;
 #endif
 
   DISALLOW_COPY_AND_ASSIGN(AshTestBase);
 };
 
 }  // namespace test
 }  // namespace ash
 
 #endif  // ASH_TEST_ASH_TEST_BASE_H_