Adds DesktopWindowTreeHostMus

ui/views/widget/desktop_aura/desktop_cursor_loader_updater_chromeos.cc

+// Copyright 2016 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_aura/desktop_cursor_loader_updater.h"
+
+#include "base/macros.h"
+#include "base/memory/ptr_util.h"
+
+namespace views {
+namespace {
+
+// Mus handles cursor, so this class need not do anything.
+class DesktopCursorLoaderUpdaterChromeos : public DesktopCursorLoaderUpdater {
+ public:
+  DesktopCursorLoaderUpdaterChromeos() {}
+  ~DesktopCursorLoaderUpdaterChromeos() override {}
+
+  // DesktopCursorLoaderUpdater:
+  void OnCreate(float device_scale_factor, ui::CursorLoader* loader) override {}
+  void OnDisplayUpdated(const display::Display& display,
+                        ui::CursorLoader* loader) override {}
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(DesktopCursorLoaderUpdaterChromeos);
+};
+
+}  // namespace
+
+// static
+std::unique_ptr<DesktopCursorLoaderUpdater>
+DesktopCursorLoaderUpdater::Create() {
+  std::unique_ptr<DesktopCursorLoaderUpdaterChromeos> loader =
+      base::MakeUnique<DesktopCursorLoaderUpdaterChromeos>();
+  return std::move(loader);
+}
+
+}  // namespace views