| jsObjectRef | JavaScript object reference. |
| methodName | JavaScript method name. |
| argc | Number of arguments. |
| jsArgv | Argument arrays. |
| timeout | Wait time in milliseconds for synchronous API calls. Set to 0 for no timeout (infinite wait). |
IntPtr Object handle returned by JavaScript method, and should convert to corresponding CSharp object via GetValueXXX.
Synchronously call a specified JavaScript function which returns a promise.