code: function (position, callback) {
              var lastPosition = this._lastMousePosition;
              lastPosition.x = position.x;
              lastPosition.y = position.y;
              this._sendEvent('mousemove', position.x, position.y);
              this._callCallback(callback);
          }
docs: Sets the mouse position, with PhantomJS screen coordinates.
  @param {Object} position position where to set the mouse (given as an object with x and y properties, in
  PhantomJS screen coordinates)
  @param {aria.core.CfgBeans:Callback} callback