Increase tolerance in rectilinear quad detection Bug: chromium:923946 Change-Id: Idabe4dde28aa37e42e573c36fba9cdb8c0135689 Reviewed-on: https://skia-review.googlesource.com/c/185685 Reviewed-by: Brian Salomon <bsalomon@google.com> Commit-Queue: Michael Ludwig <michaelludwig@google.com>