fix path ops fuzz bug

fix path ops fuzz bug

If one path is empty and the other has extreme values, the
intermediate coincident paths cannot be resolved, but triggers
an assert that a data structure unexpectedly has zero-length.

Tunnel this failure back up to the top and return that the
entire path op fails.

A future optimization could detect the empty path and avoid
this, allowing the op to succeed -- not sure that it's worth
the additional logic though.

TBR=reed@google.com
BUG=535151
GOLD_TRYBOT_URL= https://gold.skia.org/search2?unt=true&query=source_type%3Dgm&master=false&issue=1730293002

Committed: https://skia.googlesource.com/skia/+/d78c088b6136590371fddd4cab67bfb4bf692fd3

[caryclark, 2016-02-24 15:51:00]

Description was changed from

==========
fix path ops fuzz bug

If one path is empty and the other has extreme values, the
intermediate coincident paths cannot be resolved, but triggers
an assert that a data structure unexpectedly has zero-length.

Tunnel this failure back up to the top and return that the
entire path op fails.

A future optimization could detect the empty path and avoid
this, allowing the op to succeed -- not sure that it's worth
the additional logic though.

TBR=reed@google.com
BUG=535151
==========

to

==========
fix path ops fuzz bug

If one path is empty and the other has extreme values, the
intermediate coincident paths cannot be resolved, but triggers
an assert that a data structure unexpectedly has zero-length.

Tunnel this failure back up to the top and return that the
entire path op fails.

A future optimization could detect the empty path and avoid
this, allowing the op to succeed -- not sure that it's worth
the additional logic though.

TBR=reed@google.com
BUG=535151
GOLD_TRYBOT_URL=
https://gold.skia.org/search2?unt=true&query=source_type%3Dgm&master=false&is...
==========

[caryclark, 2016-02-24 15:51:27]

The CQ bit was checked by caryclark@google.com to run a CQ dry run

[commit-bot: I haz the power, 2016-02-24 15:51:37]

Dry run: CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1730293002/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1730293002/1

[commit-bot: I haz the power, 2016-02-24 16:14:23]

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

[commit-bot: I haz the power, 2016-02-24 16:14:23]

Dry run: This issue passed the CQ dry run.

[caryclark, 2016-02-24 17:00:24]

The CQ bit was checked by caryclark@google.com

[commit-bot: I haz the power, 2016-02-24 17:00:37]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1730293002/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1730293002/1

[commit-bot: I haz the power, 2016-02-24 17:03:09]

Description was changed from

==========
fix path ops fuzz bug

If one path is empty and the other has extreme values, the
intermediate coincident paths cannot be resolved, but triggers
an assert that a data structure unexpectedly has zero-length.

Tunnel this failure back up to the top and return that the
entire path op fails.

A future optimization could detect the empty path and avoid
this, allowing the op to succeed -- not sure that it's worth
the additional logic though.

TBR=reed@google.com
BUG=535151
GOLD_TRYBOT_URL=
https://gold.skia.org/search2?unt=true&query=source_type%3Dgm&master=false&is...
==========

to

==========
fix path ops fuzz bug

If one path is empty and the other has extreme values, the
intermediate coincident paths cannot be resolved, but triggers
an assert that a data structure unexpectedly has zero-length.

Tunnel this failure back up to the top and return that the
entire path op fails.

A future optimization could detect the empty path and avoid
this, allowing the op to succeed -- not sure that it's worth
the additional logic though.

TBR=reed@google.com
BUG=535151
GOLD_TRYBOT_URL=
https://gold.skia.org/search2?unt=true&query=source_type%3Dgm&master=false&is...

Committed:
https://skia.googlesource.com/skia/+/d78c088b6136590371fddd4cab67bfb4bf692fd3
==========

[commit-bot: I haz the power, 2016-02-24 17:03:10]

Committed patchset #1 (id:1) as
https://skia.googlesource.com/skia/+/d78c088b6136590371fddd4cab67bfb4bf692fd3