@Override
  public void onRequestStart(
      ImageRequest request, Object callerContext, String requestId, boolean isPrefetch) {
    mDebugImageTracker.trackImageRequest(request, requestId);
  }
Fresco image {@link RequestListener} that logs events for Sonar.
tools/flipper-fresco-plugin/src/main/java/com/facebook/flipper/plugins/fresco/FrescoFlipperRequestListener.java