Fix an infinite loop in agg's stroke_calc_arc().

Fix an infinite loop in agg's stroke_calc_arc().

BUG=pdfium:466
Committed: https://pdfium.googlesource.com/pdfium/+/8833342afc225214ce7180db612f104c9880f2c8

[Lei Zhang, 2016-04-06 02:32:47]

thestig@chromium.org changed reviewers:
+ tsepez@chromium.org

[Tom Sepez, 2016-04-06 17:07:08]

Change is fine, but what about upstream?  Bug filed there?  Do we also want a
.patch file or README here in case this gets rev'd?

[Lei Zhang, 2016-04-07 00:02:17]

On 2016/04/06 17:07:08, Tom Sepez wrote:
> Change is fine, but what about upstream?  Bug filed there?  Do we also want a
> .patch file or README here in case this gets rev'd?

https://sourceforge.net/p/agg/svn/HEAD/tree/agg-2.4/ is the active upstream
AFAICT. The original AGG author passed away several years ago. :(

A patch would cleanly apply, but the code there has the same problem. I can look
into upstreaming later.

[Lei Zhang, 2016-04-07 00:08:48]

I added a README.pdfium and a .patch file.

[Tom Sepez, 2016-04-07 04:59:03]

lgtm

[Lei Zhang, 2016-04-07 06:44:21]

The CQ bit was checked by thestig@chromium.org

[commit-bot: I haz the power, 2016-04-07 06:44:32]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1861963002/40001
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1861963002/40001

[commit-bot: I haz the power, 2016-04-07 06:57:35]

Description was changed from

==========
Fix an infinite loop in agg's stroke_calc_arc().

BUG=pdfium:466
==========

to

==========
Fix an infinite loop in agg's stroke_calc_arc().

BUG=pdfium:466

Committed:
https://pdfium.googlesource.com/pdfium/+/8833342afc225214ce7180db612f104c9880...
==========

[commit-bot: I haz the power, 2016-04-07 06:57:36]

Committed patchset #3 (id:40001) as
https://pdfium.googlesource.com/pdfium/+/8833342afc225214ce7180db612f104c9880...