Set up new desktop classes.

ui/views/widget/desktop_root_window_host_linux.cc

Index: ui/views/widget/desktop_root_window_host_linux.cc
===================================================================
--- ui/views/widget/desktop_root_window_host_linux.cc	(revision 0)
+++ ui/views/widget/desktop_root_window_host_linux.cc	(revision 0)
@@ -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.
+
+#include "ui/views/widget/desktop_root_window_host_linux.h"
+
+#include "ui/aura/root_window.h"
+
+namespace views {
+
+////////////////////////////////////////////////////////////////////////////////
+// DesktopRootWindowHostLinux, public:
+
+DesktopRootWindowHostLinux::DesktopRootWindowHostLinux() {
+}
+
+DesktopRootWindowHostLinux::~DesktopRootWindowHostLinux() {
+}
+
+////////////////////////////////////////////////////////////////////////////////
+// DesktopRootWindowHost, public:
+
+// static
+DesktopRootWindowHost* DesktopRootWindowHost::Create() {
+  return new DesktopRootWindowHostLinux;
+}
+
+}  // namespace views