Fix skia bug 2845

Fix skia bug 2845

Shouldn't call Fast Blur path(DoubleRowBoxBlur_NEON)
when kernelsize is 1. Or, uint16x8_t resultPixels will be overflow.

BUG=skia:2845
R=senorblanco@chromium.org

Committed: https://skia.googlesource.com/skia/+/b1629c5d9eb6236429cca1502d3bf5fcda8e3406

[reed1, 2014-09-19 12:56:54]

reed@google.com changed reviewers:
+ humper@google.com

[hcm, 2015-02-12 16:57:00]

hcm@google.com changed reviewers:
+ msarett@google.com, mtklein@google.com

[hcm, 2015-02-12 16:57:23]

On 2014/09/19 12:56:54, reed1 wrote:

Adding Mike and Matt to help get this moving

[msarett, 2015-02-17 15:39:00]

The CQ bit was checked by msarett@google.com

[commit-bot: I haz the power, 2015-02-17 15:39:31]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/587543003/1

[commit-bot: I haz the power, 2015-02-17 15:39:31]

Note for Reviewers:
The CQ is waiting for an approval.
If you believe that the CL is not ready yet, or if you would like to L-G-T-M
with comments then please uncheck the CQ checkbox.

Waiting for LGTM from valid reviewer(s) till 2015-02-17 21:39 UTC

[msarett, 2015-02-17 15:40:04]

The CQ bit was unchecked by msarett@google.com

[msarett, 2015-02-17 15:40:55]

lgtm

[msarett, 2015-02-17 15:41:19]

The CQ bit was checked by msarett@google.com

[commit-bot: I haz the power, 2015-02-17 15:42:28]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/587543003/1

[commit-bot: I haz the power, 2015-02-17 16:01:56]

Committed patchset #1 (id:1) as
https://skia.googlesource.com/skia/+/b1629c5d9eb6236429cca1502d3bf5fcda8e3406