Fix to check for inf when generating quadratic points

Fix to check for inf when generating quadratic points

BUG=skia:3453
Committed: https://skia.googlesource.com/skia/+/5a23a14b1fbc7503bdeff83e4b45ae7c258c6e96

[egdaniel, 2015-02-23 16:49:34]

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

[egdaniel, 2015-02-23 16:49:34]

Local testing shows that the change to the GM causes us to assert before the
change and not after. Also the actual gm draws the same so there should be no
rebaselining needed.

[bsalomon, 2015-02-23 19:35:14]

lgtm

[egdaniel, 2015-02-25 14:34:08]

The CQ bit was checked by egdaniel@google.com

[egdaniel, 2015-02-25 14:34:09]

The patchset sent to the CQ was uploaded after l-g-t-m from bsalomon@google.com
Link to the patchset: https://codereview.chromium.org/948043003/#ps20001 (title:
"update")

[commit-bot: I haz the power, 2015-02-25 14:34:57]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/948043003/20001

[commit-bot: I haz the power, 2015-02-25 14:41:53]

Committed patchset #2 (id:20001) as
https://skia.googlesource.com/skia/+/5a23a14b1fbc7503bdeff83e4b45ae7c258c6e96