Merge pull request #2381 from edx/jmclaus/feature_video_speed_control_improved_a11y

Keyboard events and ARIA markup added to speed control

lms/templates/video.html

@@ -71,7 +71,7 @@
                               <h3>${_('Speed')}</h3>
                               <p class="active"></p>
                           </a>
-                          <ol class="video_speeds"></ol>
+                          <ol class="video_speeds" role="menu"></ol>
                       </div>
                       <div class="volume">
                           <a href="#" title="${_('Volume')}" role="button" aria-disabled="false"></a>