function updateMouseMovementPolyfillState(event) {
            if (event !== lastMouseEvent) {
              if (lastMouseEvent && event.type === "mousemove") {
                lastMovementX = event.screenX - lastMouseEvent.screenX;
                lastMovementY = event.screenY - lastMouseEvent.screenY;
              } else {
                lastMovementX = 0;
                lastMovementY = 0;
              }
              lastMouseEvent = event;
            }
          }
Checks if this event should be released back into the pool.

@return {boolean} True if this should not be released, false otherwise.