onIsUvpaaRequest property
      
      EventStream<IsUvpaaRequest> 
      get
      onIsUvpaaRequest
      
    
    
Fires when a
PublicKeyCredential.isUserVerifyingPlatformAuthenticatorAvailable()
call occurs. The extension must supply a response by calling
completeIsUvpaaRequest() with the requestId
from requestInfo
Implementation
EventStream<IsUvpaaRequest> get onIsUvpaaRequest =>
    $js.chrome.webAuthenticationProxy.onIsUvpaaRequest
        .asStream(($c) => ($js.IsUvpaaRequest requestInfo) {
              return $c(IsUvpaaRequest.fromJS(requestInfo));
            });