Initialize subrun variables to make Valgrind happy

Initialize subrun variables to make Valgrind happy

The check at line 1259 was failing in Valgrind, and in 
the default constructor subrun.fMaskFormat is never inited.
Also set some other variables to avoid future problems.

Committed: https://skia.googlesource.com/skia/+/ce79a3a7440b881fdb9a3d0278815b8c45c32b28

[jvanverth1, 2015-09-09 21:39:05]

jvanverth@google.com changed reviewers:
+ egdaniel@google.com, joshualitt@google.com

[robertphillips, 2015-09-09 21:40:34]

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

[robertphillips, 2015-09-09 21:40:34]

lgtm

[jvanverth1, 2015-09-10 12:38:21]

jvanverth@google.com changed required reviewers:
+ joshualitt@google.com

[jvanverth1, 2015-09-10 12:38:53]

On 2015/09/09 21:40:34, robertphillips wrote:
> lgtm

Still would like joshualitt@ to take a look.

[joshualitt, 2015-09-10 13:25:00]

On 2015/09/10 12:38:53, jvanverth1 wrote:
> On 2015/09/09 21:40:34, robertphillips wrote:
> > lgtm
> 
> Still would like joshualitt@ to take a look.

This should be fine.  I didn't initialize them because I figured they weren't
used, but apparently that was not a true assumption.  lgtm

[jvanverth1, 2015-09-10 13:25:57]

The CQ bit was checked by jvanverth@google.com

[commit-bot: I haz the power, 2015-09-10 13:26:11]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1315773005/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1315773005/1

[commit-bot: I haz the power, 2015-09-10 13:31:43]

Committed patchset #1 (id:1) as
https://skia.googlesource.com/skia/+/ce79a3a7440b881fdb9a3d0278815b8c45c32b28