Add desktop vs. ash context to ui_controls

ui/aura/desktop_ui_controls.h

+// 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_DESKTOP_UI_CONTROLS_H_
+#define UI_AURA_DESKTOP_UI_CONTROLS_H_
+
+#include "ui/aura/aura_export.h"
+
+namespace ui_controls {
+class UIControls;
+}
+
+namespace aura {
+
+class RootWindow;
+
+// Creates a UIControls that handle desktop aura events. Caller owns the result.
+AURA_EXPORT ui_controls::UIControls* CreateDesktopUIControls(
+    RootWindow* window);
+
+}  // namespace aura
+
+#endif  // UI_AURA_DESKTOP_UI_CONTROLS_H_
+