list() {
    return this.startOperation_(this.list_());
  }
Lists all the stored content available.

@return {!Promise<!Array<shaka.extern.StoredContent>>}  A Promise to an
  array of structures representing all stored content.  The "offlineUri"
  member of the structure is the URI that should be given to Player.load()
  to play this piece of content offline.  The "appMetadata" member is the
  appMetadata argument you passed to store().
@export