This switches to a new way of doing this, enforcing the caching with the type
recorded rather than having to do it in SkRecorder. Should be more foolproof.
Updated SkPath and SkBitmap's equivalents too. ImmutableBitmap was close,
but using inheritance now makes the rest of the code less weird.
BUG=437511
I'm not sure whether or not this will _fix_ the SkMatrix aspect of that bug.
There may be other SkMatrices that we're racing on. It does cover the obvious
ones, though, and removing the SkTRacy<> wrapper will allow TSAN to show
us any other races.
It turned out to be easier to turn missing optional matrices into I early rather
than late. I figure this should be harmless. Recording and playback perf both
look neutral.
Review URL: https://codereview.chromium.org/773433003
af57903f33