fixing onSkipScanlines png error

fixing onSkipScanlines png error

There was a bug in onSkipScanlines where NULL was being passed instead of the SrcRow to png_read_rows.
This caused SkipScanlines to appear to be skipping, as fCurrScanline was updated and SkipScanlines returned success, however png_read_rows was not actually reading anything, and no lines were skipped.

Committed: https://skia.googlesource.com/skia/+/7dc9190b765d00467bed7076bacb568fb894e137

[emmaleer, 2015-05-26 22:22:33]

emmaleer@google.com changed reviewers:
+ scroggo@google.com

[emmaleer, 2015-05-26 22:24:29]

Fixed onSkipScanlines png error, which was passing null to png_read_rows instead
of SrcRow.

[scroggo, 2015-05-27 13:48:30]

lgtm

[emmaleer, 2015-05-27 15:43:16]

The CQ bit was checked by emmaleer@google.com

[commit-bot: I haz the power, 2015-05-27 15:43:23]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1159853003/1

[commit-bot: I haz the power, 2015-05-27 15:49:08]

Committed patchset #1 (id:1) as
https://skia.googlesource.com/skia/+/7dc9190b765d00467bed7076bacb568fb894e137

[scroggo, 2015-05-27 17:14:08]

On 2015/05/27 15:49:08, I haz the power - commit-bot wrote:
> Committed patchset #1 (id:1) as
> https://skia.googlesource.com/skia/+/7dc9190b765d00467bed7076bacb568fb894e137

For posterity, this was originally a part of
https://codereview.chromium.org/1134113006/