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

ui/events/ozone/evdev/event_converter_evdev_impl.h

Index: ui/events/ozone/evdev/event_converter_evdev_impl.h
diff --git a/ui/events/ozone/evdev/event_converter_evdev_impl.h b/ui/events/ozone/evdev/event_converter_evdev_impl.h
index 278651f5c3d86023ba0694ac6d4fc21bb78a1bd0..cc54229221645720ddf9cc172257368aa1201e25 100644
--- a/ui/events/ozone/evdev/event_converter_evdev_impl.h
+++ b/ui/events/ozone/evdev/event_converter_evdev_impl.h
@@ -55,8 +55,10 @@ class EVENTS_OZONE_EVDEV_EXPORT EventConverterEvdevImpl
                    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.
@@ -84,6 +86,10 @@ class EVENTS_OZONE_EVDEV_EXPORT EventConverterEvdevImpl
   // 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_;