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This is our first attempt, mostly to feel this out.  Performance and
correctness problems are both possible.  Please revert this if a benchmark even
smells funny.

That said, we've been working on this a while, are pretty confident it's good
stuff, and have had Skia's internal testing entirely switched over for a week.
Parts of Chromium that serialize and deserialize SkPictures are already
switched over.  This CL finishes things off by switching the default
recorded-from-scratch SkPicture to use SkRecord too.

BUG=408985,409110,409138

Committed: https://chromium.googlesource.com/chromium/src/+/f7450daaf38f4951b23fabaaaf659c6af33a705c

Committed: https://chromium.googlesource.com/chromium/src/+/5f2a6ab31313eb2fc6e456f65c3863a77d2d0c30

CQ_EXTRA_TRYBOTS=tryserver.blink:linux_blink_rel,linux_blink_dbg;tryserver.chromium.linux:linux_browser_asan

Committed: https://chromium.googlesource.com/chromium/src/+/130033d6c732af90ed117f05517e4efffd23ae58

Review URL: https://codereview.chromium.org/504823003

Cr-Commit-Position: refs/heads/master@{#293503}