This patch implements Chromium's Aura gesture recognizer in terms of utouch-grail and utouch-frame …

ui/base/touch/multi_touch_device_x11.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_BASE_TOUCH_MULTI_TOUCH_DEVICE_X11_H_
+#define UI_BASE_TOUCH_MULTI_TOUCH_DEVICE_X11_H_
+#pragma once
+
+#include <X11/extensions/XInput.h>
+#include <X11/extensions/XInput2.h>
+
+namespace ui {
+  class MultiTouchDevice;
+
+  // Assemble a multi-touch device from an XIDeviceInfo.
+  // Returns true on success, false otherwise.
+  bool xi_device_info_to_mt_device(XIDeviceInfo * info,
+                                   MultiTouchDevice & out);
+
+}  // namespace ui
+
+#endif  // UI_BASE_TOUCH_MULTI_TOUCH_DEVICE_X11_H_
+