fixes for conics

fixes for conics

- use std tolerance in edgebuilder, since the path has not been scaled-up to its super-sample size (that happens in the builder methods.

- off-by-1 fix for pathops when using the output of the conicquadder

BUG=skia:

Committed: https://skia.googlesource.com/skia/+/3f4e045b4f8b97d189162d17c85b8410e083a3af

[reed1, 2015-01-06 15:35:13]

reed@google.com changed reviewers:
+ caryclark@google.com

[reed1, 2015-01-06 15:35:19]

The CQ bit was checked by reed@google.com

[commit-bot: I haz the power, 2015-01-06 15:35:46]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/837023002/1

[commit-bot: I haz the power, 2015-01-06 15:35:46]

Note for Reviewers:
The CQ is waiting for an approval.
If you believe that the CL is not ready yet, or if you would like to L-G-T-M
with comments then please uncheck the CQ checkbox.

Waiting for LGTM from valid reviewer(s) till 2015-01-06 21:35 UTC

[reed1, 2015-01-06 15:37:39]

reed@google.com changed reviewers:
+ egdaniel@google.com

[egdaniel, 2015-01-06 15:39:19]

lgtm

[commit-bot: I haz the power, 2015-01-06 15:44:25]

Committed patchset #1 (id:1) as
https://skia.googlesource.com/skia/+/3f4e045b4f8b97d189162d17c85b8410e083a3af