The QNetworkReply::uploadProgress signal is intended for updating UI
elements such as a progress bar.
Limit the signal emissions to 10 per second to prevent overloading
the UI with updates.
As with the downloadProgress choke, this is implemented by dropping
signals that occur within 100ms of the previous emission.
The 100% signal is always emitted (bytesSent == bytesTotal)
When the upload size is initially unknown, this behaviour is still
provided by the upload device emitting a suitable readProgress
signal when EOF is reached.
Task-number: QTBUG-20449
Change-Id: I77e03c8a49109106e1c375ee00380293fd326b63
Reviewed-by: Martin Petersson <Martin.Petersson@nokia.com>