Add window manager component.

wm/foreign_test_window.h

Index: wm/foreign_test_window.h
diff --git a/wm/foreign_test_window.h b/wm/foreign_test_window.h
new file mode 100644
index 0000000000000000000000000000000000000000..8c6a00cb6f5aca2efd20675012381be9b2264b38
--- /dev/null
+++ b/wm/foreign_test_window.h
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+// Copyright (c) 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 WM_FOREIGN_TEST_WINDOW_H_
+#define WM_FOREIGN_TEST_WINDOW_H_
+
+#include "base/basictypes.h"
+#include "base/callback.h"
+#include "base/compiler_specific.h"
+#include "base/memory/scoped_ptr.h"
+
+namespace aura {
+class RootWindow;
+}
+
+namespace wm {
+class ForeignTestWindowHost;
+
+// This class implements a foreign window to use for testing purposes.
+class ForeignTestWindow {
+ public:
+  struct CreateParams {
+    explicit CreateParams(aura::RootWindow* root_window);
+
+    aura::RootWindow* root_window;
+  };
+  explicit ForeignTestWindow(const CreateParams& params);
+  virtual ~ForeignTestWindow();
+
+  void Show();
+  void Hide();
+  void Destroy();
+  void Sync();
+
+ private:
+  ForeignTestWindowHost* host_;
+
+  DISALLOW_COPY_AND_ASSIGN(ForeignTestWindow);
+};
+
+}  // namespace wm
+
+#endif  // WM_FOREIGN_TEST_WINDOW_H_