Do not update the progress if it is the same as the last given progress.

    public void onProgressChanged(int newProgress) {

        // Synchronize so that mLatestProgress is up-to-date.

        synchronized (this) {

            mLatestProgress = newProgress;

            if (mWebChromeClient == null) {

            if (mWebChromeClient == null || mLatestProgress == newProgress) {

                return;

            }

            mLatestProgress = newProgress;

            if (!mProgressUpdatePending) {

                sendEmptyMessage(PROGRESS);

                mProgressUpdatePending = true;