Deprecate (and reimpl) TightBounds

This is maintained for internal calls in pathops impl, but all
public callers should just use SkPath::computeTightBounds().

The public API remains for the moment, but will be removed.

Change-Id: I324c1e846d8db5839850d1e684c263713efd5c07
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/937041
Auto-Submit: Mike Reed <mike@reedtribe.org>
Commit-Queue: Michael Ludwig <michaelludwig@google.com>
Reviewed-by: Michael Ludwig <michaelludwig@google.com>
Reviewed-by: Florin Malita <fmalita@google.com>
8 files changed