public GifRequestBuilder<ModelType> centerCrop() {
        return transformFrame(glide.getBitmapCenterCrop());
    }
Transforms each frame of the GIF using {@link com.bumptech.glide.load.resource.bitmap.CenterCrop}.

@see #fitCenter()
@see #transformFrame(BitmapTransformation...)
@see #transformFrame(Transformation[])
@see #transform(Transformation[])

@return This request builder.
core/src/main/java/com/bumptech/glide/GifRequestBuilder.java