add pathops tight bounds; conform path ops' gyp to unit tests

add pathops tight bounds; conform path ops' gyp to unit tests

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.

TBR=mtklein
BUG=skia:1712
Committed: https://skia.googlesource.com/skia/+/a8d2ffb1c2e245ae06bdd1c20f34995ab8311cf6

[caryclark, 2014-06-23 15:53:15]

The CQ bit was checked by caryclark@google.com

[commit-bot: I haz the power, 2014-06-23 15:53:22]

CQ is trying da patch. Follow status at
 https://skia-tree-status.appspot.com/cq/caryclark@google.com/348343002/1

[commit-bot: I haz the power, 2014-06-23 15:53:26]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2014-06-23 15:53:27]

Presubmit check for 348343002-1 failed and returned exit status 1.

Running presubmit commit checks ...

** Presubmit ERRORS **
Since the CL is editing public API, you must have an LGTM from one of:
('reed@chromium.org', 'reed@google.com', 'bsalomon@chromium.org',
'bsalomon@google.com')

[caryclark, 2014-06-23 15:54:51]

Brian, please review for the public api change

[bsalomon, 2014-06-24 13:19:35]

lgtm

[caryclark, 2014-06-24 14:40:29]

The CQ bit was checked by caryclark@google.com

[commit-bot: I haz the power, 2014-06-24 14:40:39]

CQ is trying da patch. Follow status at
 https://skia-tree-status.appspot.com/cq/caryclark@google.com/348343002/1

[commit-bot: I haz the power, 2014-06-24 14:55:16]

Change committed as a8d2ffb1c2e245ae06bdd1c20f34995ab8311cf6