@Override
          public void onResponse(InputStream response, int responseLength) throws IOException {
            if (FrescoSystrace.isTracing()) {
              FrescoSystrace.beginSection("NetworkFetcher->onResponse");
            }
            NetworkFetchProducer.this.onResponse(fetchState, response, responseLength);
            if (FrescoSystrace.isTracing()) {
              FrescoSystrace.endSection();
            }
          }
Time between two consecutive partial results are propagated upstream

<p>TODO 5399646: make this configurable
imagepipeline/src/main/java/com/facebook/imagepipeline/producers/NetworkFetchProducer.java