Reland "SkPDF: Annotations are clipped by canvas clip stack."

Original patch was created by halcanary@google.com, and was reverted
because it triggered crbug.com/503541.

This patch fixes a bug in the original patch about clip path
transformation.

> Also, remove some SkPDFDevice functions.
> Will fix this GM: http://crrev.com/1159273003
> BUG=skia:3872
> Review URL: https://codereview.chromium.org/1148263005

BUG=skia:3872
BUG=503514

Review URL: https://codereview.chromium.org/1238503007
3 files changed