has a pdf/a switch. sets metadata in factory. BUG=skia: GOLD_TRYBOT_URL= https://gold.skia.org/search2?unt=true&query=source_type%3Dgm&master=false&issue=1916093002 Review URL: https://codereview.chromium.org/1916093002
When possible use run-time checks (via SkDocument::CreatePDF) When PDF is disabled, do not compile tests/PDF*.cpp Review URL: https://codereview.chromium.org/1278403006