Port Chromium OS touch noise filtering to Chromium

ui/events/ozone/evdev/touch_evdev_types.h

+// Copyright 2015 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_EVENTS_OZONE_EVDEV_TOUCH_EVDEV_TYPES_H_
+#define UI_EVENTS_OZONE_EVDEV_TOUCH_EVDEV_TYPES_H_
+
+#include "base/basictypes.h"
+#include "ui/events/event_constants.h"
+#include "ui/events/ozone/evdev/events_ozone_evdev_export.h"
+
+namespace ui {
+
+// Number of supported touch slots. ABS_MT_SLOT messages with
+// value >= kNumTouchEvdevSlots are ignored.
+const int kNumTouchEvdevSlots = 20;
+
+// Contains information about an in progress touch.
+struct EVENTS_OZONE_EVDEV_EXPORT InProgressTouchEvdev {
+  InProgressTouchEvdev();
+  ~InProgressTouchEvdev();
+
+  // Whether there is new information for the touch.
+  bool altered;
+
+  // Whether the touch was cancelled. Touch events should be ignored till a
+  // new touch is initiated.
+  bool cancelled;
+
+  bool was_touching;
+  bool touching;
+  float x;
+  float y;
+  int tracking_id;
+  size_t slot;
+  float radius_x;
+  float radius_y;
+  float pressure;
+};
+
+}  // namespace ui
+
+#endif  // UI_EVENTS_OZONE_EVDEV_TOUCH_EVDEV_TYPES_H_