static support() {
    const registry = shaka.offline.StorageMuxer.getRegistry_();
    // Make sure that we will have SOME mechanisms created by creating a
    // mechanism and immediately destroying it.
    for (const create of registry.values()) {
      const instance = create();

      if (instance) {
        instance.destroy();
        return true;
      }
    }

    return false;
  }
Check if there is support for storage on this platform. It is assumed that
if there are any mechanisms registered, it means that storage is supported
on this platform. We do not check if the mechanisms have any cells.

@return {boolean}