  void SimulateGestureFlingStartEvent(float velocityX,
                                      float velocityY,
                                      blink::WebGestureDevice sourceDevice) {
    SimulateGestureEventCore(SyntheticWebGestureEventBuilder::BuildFling(
        velocityX, velocityY, sourceDevice));
  }

The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly.