Harden degenerate gradient context handling

Harden degenerate gradient context handling

Certain inputs produce degenerate values at context creation time only.

Detect such cases after context creation, and abort drawing by returning
a null shader context instead.

BUG=skia:5821
R=reed@google.com,brianosman@google.com
GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=2397473003

Committed: https://skia.googlesource.com/skia/+/088e21ba652ceaa4abb4ba8cdd2ec1bc8afc32ed

[f(malita), 2016-10-04 20:03:12]

Description was changed from

==========
Harden degenerate gradient handling

Certain inputs produce degenerate values at context creation time only.

Detect such cases after context creation, and abort drawing by returning
a null shader context instead.

BUG=skia:5821
R=reed@google.com,brianosman@google.com
==========

to

==========
Harden degenerate gradient handling

Certain inputs produce degenerate values at context creation time only.

Detect such cases after context creation, and abort drawing by returning
a null shader context instead.

BUG=skia:5821
R=reed@google.com,brianosman@google.com
GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=2397473003
==========

[f(malita), 2016-10-04 20:15:53]

Description was changed from

==========
Harden degenerate gradient handling

Certain inputs produce degenerate values at context creation time only.

Detect such cases after context creation, and abort drawing by returning
a null shader context instead.

BUG=skia:5821
R=reed@google.com,brianosman@google.com
GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=2397473003
==========

to

==========
Harden degenerate gradient context handling

Certain inputs produce degenerate values at context creation time only.

Detect such cases after context creation, and abort drawing by returning
a null shader context instead.

BUG=skia:5821
R=reed@google.com,brianosman@google.com
GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=2397473003
==========

[f(malita), 2016-10-04 20:17:03]

The CQ bit was checked by fmalita@chromium.org to run a CQ dry run

[commit-bot: I haz the power, 2016-10-04 20:17:12]

Dry run: CQ is trying da patch. Follow status at
 
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.chromium.or...

[commit-bot: I haz the power, 2016-10-04 20:41:03]

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

[commit-bot: I haz the power, 2016-10-04 20:41:04]

Dry run: This issue passed the CQ dry run.

[reed1, 2016-10-05 16:12:05]

lgtm

[f(malita), 2016-10-05 16:27:25]

The CQ bit was checked by fmalita@chromium.org

[commit-bot: I haz the power, 2016-10-05 16:27:27]

CQ is trying da patch. Follow status at
 
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.chromium.or...

[commit-bot: I haz the power, 2016-10-05 16:28:44]

Description was changed from

==========
Harden degenerate gradient context handling

Certain inputs produce degenerate values at context creation time only.

Detect such cases after context creation, and abort drawing by returning
a null shader context instead.

BUG=skia:5821
R=reed@google.com,brianosman@google.com
GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=2397473003
==========

to

==========
Harden degenerate gradient context handling

Certain inputs produce degenerate values at context creation time only.

Detect such cases after context creation, and abort drawing by returning
a null shader context instead.

BUG=skia:5821
R=reed@google.com,brianosman@google.com
GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=2397473003

Committed:
https://skia.googlesource.com/skia/+/088e21ba652ceaa4abb4ba8cdd2ec1bc8afc32ed
==========

[commit-bot: I haz the power, 2016-10-05 16:28:45]

Committed patchset #1 (id:1) as
https://skia.googlesource.com/skia/+/088e21ba652ceaa4abb4ba8cdd2ec1bc8afc32ed