aura-x11: Add custom web cursor support.

ui/aura/cursor_x11.cc

Index: ui/aura/cursor_x11.cc
diff --git a/ui/aura/cursor_x11.cc b/ui/aura/cursor_x11.cc
new file mode 100644
index 0000000000000000000000000000000000000000..1f8af55bad444a5ead25f7d8f06695d54fd4b54a
--- /dev/null
+++ b/ui/aura/cursor_x11.cc
@@ -0,0 +1,19 @@
+// 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/aura/cursor.h"
+
+#include "ui/base/x/x11_util.h"
+
+namespace aura {
+
+void Cursor::RefCustomCursor() {
+  ui::RefCustomXCursor(platform_);
+}
+
+void Cursor::UnrefCustomCursor() {
+  ui::UnrefCustomXCursor(platform_);
+}
+
+}  // namespace aura