title: Change images slider step in TensorBoard
body: <p>TensorBoard 1.1.0's images history. I would like to set the slider's position (on top of the black image with 7) more precisely, to be able to select any step. Now I can only select e.g. between steps 2050 or 2810. Is that possible? </p>
  
  <p>Maybe a place in sources where the 10 constant is hardcoded?</p>
  
  <ul>
  <li><a href="https://i.stack.imgur.com/NQNnt.png" rel="noreferrer"><img src="https://i.stack.imgur.com/NQNnt.png" alt="enter image description here"></a></li>
  </ul>