Fix GradientShaderBase4fContext::Interval fuzzer assert

Fix GradientShaderBase4fContext::Interval fuzzer assert

Although the iterator ensures v0 != v1, 2 - v0 may still be equal to
2 - v1 for very small values due to limited float precision.

We need to recheck the inequality to avoid triggering Interval asserts.

BUG=skia:5903
R=reed@google.com
GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=2474463002

Committed: https://skia.googlesource.com/skia/+/cc34176c040c9703e351af7268dfc3a8b3cbf71d

[f(malita), 2016-11-01 20:58:46]

Description was changed from

==========
Fix GradientShaderBase4fContext::Interval fuzzer assert

Although the iterator ensures v0 != v1, 2 - v0 may still be equal to
2 - v1 for very small values.

We need to recheck the inequality to avoid triggering Interval asserts.

BUG=skia:5903
R=reed@google.com
==========

to

==========
Fix GradientShaderBase4fContext::Interval fuzzer assert

Although the iterator ensures v0 != v1, 2 - v0 may still be equal to
2 - v1 for very small values.

We need to recheck the inequality to avoid triggering Interval asserts.

BUG=skia:5903
R=reed@google.com
GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=2474463002
==========

[f(malita), 2016-11-01 20:59:17]

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

[commit-bot: I haz the power, 2016-11-01 20:59:19]

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, 2016-11-01 21:50:45]

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

[commit-bot: I haz the power, 2016-11-01 21:50:45]

Dry run: Try jobs failed on following builders:
  Test-Android-Clang-Nexus5-GPU-Adreno330-arm-Release-GN_Android-Trybot on
master.client.skia.android (JOB_FAILED,
http://build.chromium.org/p/client.skia.android/builders/Test-Android-Clang-N...)

[f(malita), 2016-11-02 14:06:02]

Description was changed from

==========
Fix GradientShaderBase4fContext::Interval fuzzer assert

Although the iterator ensures v0 != v1, 2 - v0 may still be equal to
2 - v1 for very small values.

We need to recheck the inequality to avoid triggering Interval asserts.

BUG=skia:5903
R=reed@google.com
GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=2474463002
==========

to

==========
Fix GradientShaderBase4fContext::Interval fuzzer assert

Although the iterator ensures v0 != v1, 2 - v0 may still be equal to
2 - v1 for very small values due to limited float precision.

We need to recheck the inequality to avoid triggering Interval asserts.

BUG=skia:5903
R=reed@google.com
GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=2474463002
==========

[f(malita), 2016-11-02 14:06:02]

fmalita@chromium.org changed reviewers:
+ brianosman@google.com

[Brian Osman, 2016-11-02 20:00:50]

lgtm

[f(malita), 2016-11-02 20:09:47]

The CQ bit was checked by fmalita@chromium.org

[commit-bot: I haz the power, 2016-11-02 20:09:56]

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, 2016-11-02 20:10:53]

Description was changed from

==========
Fix GradientShaderBase4fContext::Interval fuzzer assert

Although the iterator ensures v0 != v1, 2 - v0 may still be equal to
2 - v1 for very small values due to limited float precision.

We need to recheck the inequality to avoid triggering Interval asserts.

BUG=skia:5903
R=reed@google.com
GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=2474463002
==========

to

==========
Fix GradientShaderBase4fContext::Interval fuzzer assert

Although the iterator ensures v0 != v1, 2 - v0 may still be equal to
2 - v1 for very small values due to limited float precision.

We need to recheck the inequality to avoid triggering Interval asserts.

BUG=skia:5903
R=reed@google.com
GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=2474463002

Committed:
https://skia.googlesource.com/skia/+/cc34176c040c9703e351af7268dfc3a8b3cbf71d
==========

[commit-bot: I haz the power, 2016-11-02 20:10:53]

Committed patchset #1 (id:1) as
https://skia.googlesource.com/skia/+/cc34176c040c9703e351af7268dfc3a8b3cbf71d