Makes construction of (ash)RemoteWindowTreeHostWin explicit

ash/shell_init_params.h

Index: ash/shell_init_params.h
diff --git a/ash/shell_init_params.h b/ash/shell_init_params.h
new file mode 100644
index 0000000000000000000000000000000000000000..52b894e0e8b35b714dd96d460b553e960298c498
--- /dev/null
+++ b/ash/shell_init_params.h
@@ -0,0 +1,33 @@
+// Copyright 2014 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_SHELL_INIT_PARAMS_H_
+#define ASH_SHELL_INIT_PARAMS_H_
+
+#include "build/build_config.h"
+
+#if defined(OS_WIN)
+#include <windows.h>
+#endif
+
+#include "ash/ash_export.h"
+
+namespace ash {
+
+class ShellDelegate;
+
+struct ASH_EXPORT ShellInitParams {
+  ShellInitParams();
+  ~ShellInitParams();
+
+  ShellDelegate* delegate;
+
+#if defined(OS_WIN)
+  HWND remote_hwnd;
+#endif
+};
+
+}  // namespace ash
+
+#endif  // ASH_SHELL_INIT_PARAMS_H_