increase the rewind delay to 100ms (ampproject#38591)

* increase the rewind delay to 100ms

Some devices, specifically iphone 12 and up are still having the video
glitching issue with the 10ms delay. Bumping it up to 100ms seems to fix
the issue.

* add TODO and github issue link

extensions/amp-story/1.0/media-pool.js

@@ -807,7 +807,9 @@ export class MediaPool {
     return this.enqueueMediaElementTask_(poolMediaEl, new PauseTask()).then(
       () => {
         if (rewindToBeginning) {
-          // We add a 10 second delay to rewinding as sometimes this causes an
+          // TODO: https://github.com/ampproject/amphtml/issues/38595 implement
+          // proper fix to frame management.
+          // We add a 100 second delay to rewinding as sometimes this causes an
           // interlacing/glitch/frame jump when a new video is starting to play.
           // A 0 delay isn't enough as we need to push the "seeking" event
           // to the next tick of the event loop.
@@ -819,7 +821,7 @@ export class MediaPool {
               /** @type {!PoolBoundElementDef} */ (poolMediaEl),
               new SetCurrentTimeTask({currentTime: 0})
             );
-          }, 10);
+          }, 100);
         }
       }
     );