Shell of implementation for embedded windows. At this point this is

aura/desktop_host.h

Index: aura/desktop_host.h
diff --git a/aura/desktop_host.h b/aura/desktop_host.h
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+// Copyright (c) 2011 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 AURA_DESKTOP_HOST_H_
+#define AURA_DESKTOP_HOST_H_
+#pragma once
+
+#include "ui/gfx/native_widget_types.h"
+
+namespace gfx {
+class Rect;
+class Size;
+}
+
+namespace aura {
+
+class Desktop;
+
+// DesktopHost bridges between a native window and the embedded Desktop. It
+// provides the accelerated widget and maps events from the native os to aura.
+class DesktopHost {
+ public:
+  virtual ~DesktopHost() {}
+
+  // Creates a new DesktopHost. The caller owns the returned value.
+  static DesktopHost* Create(const gfx::Rect& bounds);
+
+  // Sets the Desktop this DesktopHost is hosting. DesktopHost does not own the
+  // Desktop.
+  virtual void SetDesktop(Desktop* desktop) = 0;
+
+  // Returns the accelerated widget.
+  virtual gfx::AcceleratedWidget GetAcceleratedWidget() = 0;
+
+  // Shows the DesktopHost.
+  virtual void Show() = 0;
+
+  // Returns the size of the DesktopHost.
+  virtual gfx::Size GetSize() = 0;
+};
+
+}  // namespace aura
+
+#endif  // AURA_DESKTOP_HOST_H_