@Override
    public synchronized void mark(int readlimit) {
        marked = new byte[readlimit];
        readSinceMarked = 0;
    }
<p>Constructs a new ContentInputStream that reads from the given {@link ReadableContentChannel}.</p>

@param content The content to read the stream from.
jdisc_core/src/main/java/com/yahoo/jdisc/handler/UnsafeContentInputStream.java