Sanitize SkMatrixConvolutionImageFilter creation params.

Sanitize SkMatrixConvolutionImageFilter creation params.

Apply the same memory limit in the Create() function that we do when
deserializing.

Committed: https://skia.googlesource.com/skia/+/3a49520696b2eca69e57884657d23fd2402ccfd1

[Stephen White, 2014-09-26 22:55:27]

senorblanco@chromium.org changed reviewers:
+ reed@google.com

[Stephen White, 2014-09-26 22:55:36]

reed@: PTAL. Thanks!

[Stephen White, 2014-09-28 17:07:49]

The CQ bit was checked by senorblanco@chromium.org

[commit-bot: I haz the power, 2014-09-28 17:08:32]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/610723002/1

[commit-bot: I haz the power, 2014-09-28 17:08:33]

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 a valid reviewer till 2014-09-28 23:08 UTC

[commit-bot: I haz the power, 2014-09-28 17:08:36]

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

[commit-bot: I haz the power, 2014-09-28 17:08:37]

Presubmit check for 610723002-1 failed and returned exit status 1.

Running presubmit commit checks ...

** Presubmit ERRORS **
Since the CL is editing public API, you must have an LGTM from one of:
('reed@chromium.org', 'reed@google.com', 'bsalomon@chromium.org',
'bsalomon@google.com', 'djsollen@chromium.org', 'djsollen@google.com')

[reed1, 2014-09-29 12:39:05]

lgtm

[Stephen White, 2014-09-29 14:33:59]

PTAL: added test and a Win32 fix.

[Stephen White, 2014-09-29 14:43:01]

The CQ bit was checked by senorblanco@chromium.org

[commit-bot: I haz the power, 2014-09-29 14:43:49]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/610723002/60001

[commit-bot: I haz the power, 2014-09-29 14:57:24]

Committed patchset #4 (id:60001) as 3a49520696b2eca69e57884657d23fd2402ccfd1