ash: Add RootWindowHostFactory class.

ui/aura/root_window_delegate.h

Index: ui/aura/root_window_delegate.h
diff --git a/ui/aura/root_window_delegate.h b/ui/aura/root_window_delegate.h
new file mode 100644
index 0000000000000000000000000000000000000000..9bfe98d882431eda9149f7d26babe89b2234a3ce
--- /dev/null
+++ b/ui/aura/root_window_delegate.h
@@ -0,0 +1,28 @@
+// 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 UI_AURA_ROOT_WINDOW_DELEGATE_H_
+#define UI_AURA_ROOT_WINDOW_DELEGATE_H_
+
+#include "ui/aura/aura_export.h"
+
+namespace gfx {
+class Rect;
+}
+
+namespace aura {
+class RootWindowHost;
+
+// Delegate interface for aura::RootWindow.
+class AURA_EXPORT RootWindowDelegate {
+ public:
+  virtual ~RootWindowDelegate() {}
+
+  virtual aura::RootWindowHost* CreateRootWindowHost(
+      const gfx::Rect& initial_bounds) = 0;
+};
+
+}  // namespace aura
+
+#endif  // UI_AURA_ROOT_WINDOW_DELEGATE_H_