function C(c){var a={outputUpper:!1,b64Pad:"=",shakeLen:-1};c=c||{};a.outputUpper=c.outputUpper||!1;!0===c.hasOwnProperty("b64Pad")&&(a.b64Pad=c.b64Pad);if("boolean"!==typeof a.outputUpper)throw Error("Invalid outputUpper formatting option");
if("string"!==typeof a.b64Pad)throw Error("Invalid b64Pad formatting option");return a}
Dispatches a message to the extension to find out the supported
JS API version.
If the user is on a mobile phone and is thus using Google Authenticator instead
of the Chrome extension, don't send the request and simply return 0.
@param {function((u2f.Error|u2f.GetJsApiVersionResponse))} callback
@param {number=} opt_timeoutSeconds