Add extra braces for uintNNxMx4_t initializers.

Add extra braces for uintNNxMx4_t initializers.

These structs are always implemented as
    struct uintNNxMx4_t {
        uintNNxM val[4];
    };
So, the first set of braces is for the struct, the second for val.

BUG=skia:

Committed: https://skia.googlesource.com/skia/+/05a2ac2872a8d7c5437bcce1b0828e20b4bb0eb4

[mtklein, 2015-06-26 18:04:15]

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

[mtklein, 2015-06-26 18:04:19]

The CQ bit was checked by mtklein@google.com to run a CQ dry run

[commit-bot: I haz the power, 2015-06-26 18:04:43]

Dry run: CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1221453002/1

[msarett, 2015-06-26 18:06:35]

lgtm

[mtklein, 2015-06-26 18:08:52]

The CQ bit was unchecked by mtklein@google.com

[mtklein, 2015-06-26 18:08:53]

The CQ bit was checked by mtklein@google.com

[mtklein, 2015-06-26 18:08:57]

The CQ bit was checked by mtklein@google.com

[commit-bot: I haz the power, 2015-06-26 18:09:08]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1221453002/1

[commit-bot: I haz the power, 2015-06-26 18:10:31]

Committed patchset #1 (id:1) as
https://skia.googlesource.com/skia/+/05a2ac2872a8d7c5437bcce1b0828e20b4bb0eb4