Add myself to AUTHORS file.
Add myself to AUTHORS file.

I assumed there was a *@chromium.org entry in there, so never looked.

R=tsepez@chromium.org

Review URL: https://codereview.chromium.org/1754763002 .

DrAlexx/pdfium,DrAlexx/pdfium,DrAlexx/pdfium,DrAlexx/pdfium