Function send_mouse_event 

pub fn send_mouse_event(
    tab_id: TabId,
    event: &MouseEventWui,
) -> WuiCoordCheckResult

Send some mouse event NOTE: To make this easier to use, the modifiers for the actual mouse clicks are added to the modifiers set automatically. e.g. doing a left click will add the modifier: EVENTFLAG_LEFT_MOUSE_BUTTON