Switch to the new Skia PDF generation APIs.

The new Skia PDF generation APIs are a small extension to
the code that converts drawing commands to PDF (SkPDFDevice)
and this new functionality is exposed via new APIs. This
change switches to using these new APIs allowing us to
capitalize on the new perspective support for PDF
generation.

bug:11561776

Change-Id: Ief61f7ff6a5a22c27d3acbe99a48910cb679f594