title: Creating a Gerrit review from an existing commit on a remote branch
body: <p>I've already created a remote branch and pushed to it some commits. How can I create a gerrit review on commits already existing on the remote branch?</p>
  <p>One workaround is to add an empty space in the commit message, thus changing the SHA-1 and then performing <code>git review</code>. I was wondering if there's a possible solution (perhaps directly in the gerrit web ui?) without modifying the commits.</p>