Add another dollop of sk_sp to SkSpecialImage and SkSpecialSurface

This is split out of https://codereview.chromium.org/1914883002/ (Refactor drawContext/RenderTarget creation)

GOLD_TRYBOT_URL= https://gold.skia.org/search2?unt=true&query=source_type%3Dgm&master=false&issue=1913743002

Review URL: https://codereview.chromium.org/1913743002
15 files changed