Add window manager component.

wm/host/foreign_window_host.h

Index: wm/host/foreign_window_host.h
diff --git a/wm/host/foreign_window_host.h b/wm/host/foreign_window_host.h
new file mode 100644
index 0000000000000000000000000000000000000000..811efe54c4f392ae170eec6145bc69b8641af269
--- /dev/null
+++ b/wm/host/foreign_window_host.h
@@ -0,0 +1,35 @@
+// 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 WM_HOST_FOREIGN_WINDOW_HOST_H_
+#define WM_HOST_FOREIGN_WINDOW_HOST_H_
+
+#include "ui/gfx/native_widget_types.h"
+
+namespace wm {
+class ForeignWindowHostDelegate;
+
+class ForeignWindowHost {
+ public:
+  virtual ~ForeignWindowHost() {}
+
+  // Creates a new ForeignWindowHost. The caller owns the returned value.
+  static ForeignWindowHost* Create(gfx::PluginWindowHandle window_handle);
+
+  // Sets the delegate, which is normally done by the foreign window.
+  virtual void SetDelegate(ForeignWindowHostDelegate* delegate) = 0;
+
+  // Get native window handle for foreign window.
+  virtual gfx::PluginWindowHandle GetWindowHandle() const = 0;
+
+  // Attempts to close the foreign window.
+  virtual void Close() = 0;
+
+  // Called when foreign window has been destroyed.
+  virtual void OnWindowDestroyed() = 0;
+};
+
+}  // namespace wm
+
+#endif  // WM_HOST_FOREIGN_WINDOW_HOST_H_