@Override
          public void onCancellationRequested() {
            cancellableProducerRunnable.cancel();
          }
A producer that creates video thumbnails.

<p>At present, these thumbnails are created on the java heap rather than being pinned purgeables.
This is deemed okay as the thumbnails are only very small.
imagepipeline/src/main/java/com/facebook/imagepipeline/producers/LocalVideoThumbnailProducer.java