Return failure if getInputResultsGPU fails in SkXfermodeImageFilter

Return failure if getInputResultsGPU fails in SkXfermodeImageFilter

SkXfermodeImageFilter::filterImageGPU is the only call site that does anything fancy when getInputResultsGPU fails. It seems like we can just return like everyone else (for uniformity).

Committed: https://skia.googlesource.com/skia/+/850f2d9c097575484d9438abdc3b1b8ac60d589c

[robertphillips, 2015-08-20 19:55:01]

robertphillips@google.com changed reviewers:
+ senorblanco@google.com

[Stephen White, 2015-08-20 20:42:51]

senorblanco@chromium.org changed reviewers:
+ senorblanco@chromium.org

[Stephen White, 2015-08-20 20:42:51]

LGTM if the bots like it.

There may be a reason I did this, but it escapes me.

[robertphillips, 2015-08-20 20:45:16]

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

[commit-bot: I haz the power, 2015-08-20 20:45:23]

Dry run: CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1302033004/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1302033004/1

[commit-bot: I haz the power, 2015-08-20 20:51:31]

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

[commit-bot: I haz the power, 2015-08-20 20:51:32]

Dry run: This issue passed the CQ dry run.

[robertphillips, 2015-08-21 15:23:34]

The CQ bit was checked by robertphillips@google.com

[commit-bot: I haz the power, 2015-08-21 15:23:50]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1302033004/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1302033004/1

[commit-bot: I haz the power, 2015-08-21 15:24:26]

Committed patchset #1 (id:1) as
https://skia.googlesource.com/skia/+/850f2d9c097575484d9438abdc3b1b8ac60d589c