GPU: add failure checks for the scratch textures used in Gaussian blur.

GPU:  add failure checks for the scratch textures used in Gaussian blur.

[reed1, 2012-10-18 21:29:50]

All the indents line up, but I don't know 'nothing 'bout birth'n babies.

Rob is the DEPS roll-master at the moment, so he can certainly review this
before any roll tomorrow. If you want to check it in so it cycles through Skia's
bots now, and have Rob re-review it in the morning, that's fine with me too.

[reed1, 2012-10-18 21:30:29]

Also, I have been the reviewer for all the recent DEPS rolls, so I can be sure
to remind Rob to look at this before then.

[robertphillips, 2012-10-18 22:12:22]

LGTM

[robertphillips, 2012-10-19 12:56:58]

committed as r6014

[Stephen White, 2012-10-19 13:16:26]

On 2012/10/19 12:56:58, robertphillips wrote:
> committed as r6014

Thanks, Robert!