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diff --git a/ash/test/ash_test_helper.h b/ash/test/ash_test_helper.h
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+++ b/ash/test/ash_test_helper.h
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+// Copyright 2013 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_HELPER_H_
+#define ASH_TEST_ASH_TEST_HELPER_H_
+
+#include "base/compiler_specific.h"
+#include "base/memory/scoped_ptr.h"
+
+#if defined(OS_WIN)
+#include "ui/base/win/scoped_ole_initializer.h"
+#endif
+
+namespace aura {
+class RootWindow;
+}  // namespace aura
+
+namespace base {
+class MessageLoopForUI;
+}  // namespace base
+
+namespace ui {
+class ScopedAnimationDurationScaleMode;
+}  // namespace ui
+
+namespace ash {
+namespace test {
+
+class TestMetroViewerProcessHost;
+class TestShellDelegate;
+
+// A helper class that does common initialization required for Ash. Creates a
+// root window and an ash::Shell instance with a test delegate.
+class AshTestHelper {
+ public:
+  explicit AshTestHelper(base::MessageLoopForUI* message_loop);
+  ~AshTestHelper();
+
+  // Creates the ash::Shell and performs associated initialization.
+  void SetUp();
+
+  // Destroys the ash::Shell and performs associated cleanup.
+  void TearDown();
+
+  // Returns a RootWindow. Usually this is the active RootWindow, but that
+  // method can return NULL sometimes, and in those cases, we fall back on the
+  // primary RootWindow.
+  aura::RootWindow* CurrentContext();
+
+  void RunAllPendingInMessageLoop();
+
+  base::MessageLoopForUI* message_loop() { return message_loop_; }
+  TestShellDelegate* test_shell_delegate() { return test_shell_delegate_; }
+
+ private:
+  base::MessageLoopForUI* message_loop_;  // Not owned.
+  TestShellDelegate* test_shell_delegate_;  // Owned by ash::Shell.
+  scoped_ptr<ui::ScopedAnimationDurationScaleMode> zero_duration_mode_;
+#if defined(OS_WIN)
+  scoped_ptr<TestMetroViewerProcessHost> metro_viewer_host_;
+  ui::ScopedOleInitializer ole_initializer_;
+#endif
+
+  DISALLOW_COPY_AND_ASSIGN(AshTestHelper);
+};
+
+}  // namespace test
+}  // namespace ash
+
+#endif  // ASH_TEST_ASH_TEST_HELPER_H_