Got disabled in chromium 71 upgrade https://github.com/electron/electron/commit/798b2a3ffd55c477af6258f0afb71000c9f8ecde

/cc @brenca @codebytere 
atom/browser/osr/osr_render_widget_host_view.cc
ui::EventType type = ui::EventType::ET_UNKNOWN;
  switch (event.GetType()) {
    case blink::WebInputEvent::kMouseDown:
      type = ui::EventType::ET_MOUSE_PRESSED;
      break;
    case blink::WebInputEvent::kMouseUp:
      type = ui::EventType::ET_MOUSE_RELEASED;
      break;
    case blink::WebInputEvent::kMouseMove:
      type = ui::EventType::ET_MOUSE_MOVED;
      break;
    case blink::WebInputEvent::kMouseEnter:
      type = ui::EventType::ET_MOUSE_ENTERED;
      break;
    case blink::WebInputEvent::kMouseLeave:
      type = ui::EventType::ET_MOUSE_EXITED;
      break;
    case blink::WebInputEvent::kMouseWheel:
      type = ui::EventType::ET_MOUSEWHEEL;
      break;
    default:
      type = ui::EventType::ET_UNKNOWN;
      break;
  }
  int button_flags = 0;