AndQuota(StorageUsageCallback usageCallback, [StorageErrorCallback errorCallback]) {
  if (errorCallback != null) {
    _blink.BlinkDeprecatedStorageQuota.instance.queryUsageAndQuota_Callback_2_(unwrap_jso(this), unwrap_jso(usageCallback), unwrap_jso(errorCallback));
    return;
  }
  _blink.BlinkDeprecatedStorageQuota.instance.queryUsageAndQuota_Callback_1_(unwrap_jso(this), unwrap_jso(usageCallback));
  return;
}</code></pre>
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