Initialize three locals to avoid the risk of uninitialized reads.

Initialize three locals to avoid the risk of uninitialized reads.

/analyze recently reported two new warnings about reading from
potentially uninitialized local variables:

src\third_party\skia\src\gpu\grclipmaskmanager.cpp(290) :
warning C6001: Using uninitialized memory 'requiresAA'.
src\third_party\skia\src\gpu\grclipmaskmanager.cpp(336) :
warning C6001: Using uninitialized memory 'genID'.

It is not clear whether the uninitialized reads can actually happen,
but the guarantees seem sufficiently non-obvious that the prudent thing
to do to guarantee future stability is to initialized them -- it's
cheap. I also initialized initialState because it seemed to fall in
the same class, despite there being no warning for it.

BUG=427616
Committed: https://skia.googlesource.com/skia/+/71d7f7f002332b9904bf12eb3f1908883f99120e

[brucedawson, 2015-02-26 00:51:26]

brucedawson@chromium.org changed reviewers:
+ reed@chromium.org

[brucedawson, 2015-02-26 00:51:27]

A simple change to fix a couple of /analyze warnings and make the code more
obviously correct.

I'm not sure if clipSpaceIBounds should also be initialized, perhaps by adding =
SkIRect::MakeEmpty();?

[reed2, 2015-02-26 17:51:34]

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

[reed2, 2015-02-26 17:51:34]

switching to brian's team

[bsalomon, 2015-02-26 20:50:09]

bsalomon@google.com changed reviewers:
+ joshualitt@google.com
- reed@chromium.org

[bsalomon, 2015-02-26 20:50:37]

Joshua if this lgty, then it lgtme.

[joshualitt, 2015-02-26 21:10:26]

On 2015/02/26 20:50:37, bsalomon wrote:
> Joshua if this lgty, then it lgtme.

lgtm

[brucedawson, 2015-02-26 21:15:16]

The CQ bit was checked by brucedawson@chromium.org

[commit-bot: I haz the power, 2015-02-26 21:15:50]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/957133002/1

[commit-bot: I haz the power, 2015-02-26 21:28:57]

Committed patchset #1 (id:1) as
https://skia.googlesource.com/skia/+/71d7f7f002332b9904bf12eb3f1908883f99120e