abort SkRRect::transform() before dst->scaleRadii() asserts

If we've got a crazy matrix, we can make dst arbitrarily crazy.

This should fix several of Kevin's fuzzes, e.g.
Bug: skia:7090

I don't see any uses of SkRRect::transform() that care about
the output rrect in case of failure, so I've just removed the
guarantee that we don't modify it when failing.

Change-Id: I4c81af59a093a984f0a02a0d3dc4bbbb1fb935f2
Reviewed-on: https://skia-review.googlesource.com/58620
Reviewed-by: Mike Reed <reed@google.com>
Commit-Queue: Mike Klein <mtklein@chromium.org>
2 files changed