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amp-story MediaPool breaks media-based auto-advance

See original GitHub issue

amp-story has a feature where it can auto-advance to the next page based on the completion of the playback of a media element on the current page. This media element is specified by its ID, in the auto-advance-after attribute of the current page. For example:

<amp-story-page id="page1" auto-advance-after="my-vid">
  <amp-story-grid-layer template="fill">
    <amp-video id="my-vid" src="cat.mp4" muted autoplay playsinline></amp-video>
  </amp-story-grid-layer>
</amp-story-page>

However, MediaPool swaps out all media elements when the page becomes visible, so the video actually specified when the document is published (my-vid, in the example above) is not the video that is in the DOM when the page becomes active.

We will need to somehow plumb this through.