Implement path tight bounds using path ops machinery. This is not
as efficient as it could be; for instance, internally, it creates
a path ops structure more suited to intersection. If this shows
up as a performance bottleneck, it could be improved.
Fix path ops gyp files, which have fallen out of sync with other
tests.
R=mtklein@google.com, bsalomon@google.com
TBR=mtklein
BUG=skia:1712
Author: caryclark@google.com
Review URL: https://codereview.chromium.org/348343002
