@Nullable
  public DrawableFactory getXmlDrawableFactory() {
    if (mConfig.getExperiments().isBinaryXmlEnabled()) {
      return new XmlDrawableFactory();
    } else {
      return null;
    }
  }
Defines the correct {@link ImageTranscoder}. If a custom {@link ImageTranscoder} was define in
the config, it will be used whenever possible. Else, if the native code is disabled it uses
{@link SimpleImageTranscoderFactory}. Otherwise {@link MultiImageTranscoderFactory} determines
the {@link ImageTranscoder} to use based on the image format.

@return The {@link ImageTranscoderFactory}
imagepipeline/src/main/java/com/facebook/imagepipeline/core/ImagePipelineFactory.java