[Merge] Make mouse buttons 8 - 11 navigate forward and back in history

ui/events/ozone/evdev/event_converter_evdev_impl.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_EVENT_CONVERTER_EVDEV_IMPL_H_
 #define UI_EVENTS_OZONE_EVDEV_EVENT_CONVERTER_EVDEV_IMPL_H_
 
 #include <bitset>
 
 #include "base/files/file_path.h"
@@ skipping 37 matching lines @@
 
   void ProcessEvents(const struct input_event* inputs, int count);
 
  private:
   void ConvertKeyEvent(const input_event& input);
   void ConvertMouseMoveEvent(const input_event& input);
   void OnKeyChange(unsigned int key,
                    bool down,
                    const base::TimeDelta& timestamp);
   void ReleaseKeys();
+  void ReleaseMouseButtons();
   void OnLostSync();
   void DispatchMouseButton(const input_event& input);
+  void OnButtonChange(int code, bool down, const base::TimeDelta& timestamp);
 
   // Flush events delimited by EV_SYN. This is useful for handling
   // non-axis-aligned movement properly.
   void FlushEvents(const input_event& input);
 
   // Input modalities for this device.
   bool has_keyboard_;
   bool has_touchpad_;
 
   // LEDs for this device.
   bool has_caps_lock_led_;
 
   // Save x-axis events of relative devices to be flushed at EV_SYN time.
   int x_offset_;
 
   // Save y-axis events of relative devices to be flushed at EV_SYN time.
   int y_offset_;
 
   // Controller for watching the input fd.
   base::MessagePumpLibevent::FileDescriptorWatcher controller_;
 
   // The evdev codes of the keys which should be blocked.
   std::bitset<KEY_CNT> blocked_keys_;
 
   // Pressed keys bitset.
   std::bitset<KEY_CNT> key_state_;
 
+  // Last mouse button state.
+  static const int kMouseButtonCount = BTN_JOYSTICK - BTN_MOUSE;
+  std::bitset<kMouseButtonCount> mouse_button_state_;
+
   // Shared cursor state.
   CursorDelegateEvdev* cursor_;
 
   // Callbacks for dispatching events.
   DeviceEventDispatcherEvdev* dispatcher_;
 
   DISALLOW_COPY_AND_ASSIGN(EventConverterEvdevImpl);
 };
 
 }  // namespace ui
 
 #endif  // UI_EVENTS_OZONE_EVDEV_EVENT_CONVERTER_EVDEV_IMPL_H_