ozone: evdev: Fix possibility of stuck mouse buttons

ui/events/ozone/evdev/libgestures_glue/gesture_interpreter_libevdev_cros.h

 // Copyright 2014 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_LIBGESTURES_GLUE_GESTURE_INTERPRETER_LIBEVDEV_CROS_H_
 #define UI_EVENTS_OZONE_EVDEV_LIBGESTURES_GLUE_GESTURE_INTERPRETER_LIBEVDEV_CROS_H_
 
+#include <bitset>
 #include <gestures/gestures.h>
 #include <libevdev/libevdev.h>
 
 #include "base/callback.h"
 #include "base/memory/scoped_ptr.h"
 #include "ui/events/ozone/evdev/cursor_delegate_evdev.h"
 #include "ui/events/ozone/evdev/event_device_util.h"
 #include "ui/events/ozone/evdev/event_dispatch_callback.h"
 #include "ui/events/ozone/evdev/events_ozone_evdev_export.h"
 #include "ui/events/ozone/evdev/libgestures_glue/event_reader_libevdev_cros.h"
@@ skipping 56 matching lines @@
   void OnGestureSwipe(const Gesture* gesture, const GestureSwipe* swipe);
   void OnGestureSwipeLift(const Gesture* gesture,
                           const GestureSwipeLift* swipelift);
   void OnGesturePinch(const Gesture* gesture, const GesturePinch* pinch);
   void OnGestureMetrics(const Gesture* gesture, const GestureMetrics* metrics);
 
   void DispatchMouseButton(unsigned int modifier,
                            bool down,
                            stime_t time);
   void DispatchChangedKeys(unsigned long* changed_keys, stime_t timestamp);
-  void ReleaseKeys();
+  void ReleaseKeys(stime_t timestamp);
+  bool SetMouseButtonState(unsigned int button, bool down);
+  void ReleaseMouseButtons(stime_t timestamp);
 
   // The unique device id.
   int id_;
 
   // True if the device may be regarded as a mouse. This includes normal mice
   // and multi-touch mice.
   bool is_mouse_;
 
   // The evdev codes of the keys which should be processed. nullptr if all keys
   // should be processed.
   scoped_ptr<std::set<int>> allowed_keys_;
 
   // Shared cursor state.
   CursorDelegateEvdev* cursor_;
 
   // Shared gesture property provider.
   GesturePropertyProvider* property_provider_;
 
   // Dispatcher for events.
   DeviceEventDispatcherEvdev* dispatcher_;
 
   // Gestures interpretation state.
   gestures::GestureInterpreter* interpreter_;
 
   // Last key state from libevdev.
   unsigned long prev_key_state_[EVDEV_BITS_TO_LONGS(KEY_CNT)];
 
+  // Last mouse button state.
+  static const int kMouseButtonCount = BTN_JOYSTICK - BTN_MOUSE;
+  std::bitset<kMouseButtonCount> mouse_button_state_;
+
   // Device pointer.
   Evdev* evdev_;
 
   // Gesture lib device properties.
   scoped_ptr<GestureDeviceProperties> device_properties_;
 
   DISALLOW_COPY_AND_ASSIGN(GestureInterpreterLibevdevCros);
 };
 
 }  // namspace ui
 
 #endif  // UI_EVENTS_OZONE_EVDEV_LIBGESTURES_GLUE_GESTURE_INTERPRETER_LIBEVDEV_CROS_H_