public GlideBuilder setBitmapPool(BitmapPool bitmapPool) {
        this.bitmapPool = bitmapPool;
        return this;
    }
Sets the {@link BitmapPool} implementation to use to store and
retrieve reused {@link android.graphics.Bitmap}s.

@param bitmapPool The pool to use.
@return This builder.
core/src/main/java/com/bumptech/glide/GlideBuilder.java