Transpose the samples in imagefilterscropped, and add a 1x1 blur. The latter

Transpose the samples in imagefilterscropped, and add a 1x1 blur. The latter
exercises a different path in the GPU backend, and the former is because my
tiny brain gets confused between the results of this test and imagefiltersbase.

R=reed@google.com
BUG=

Committed: https://code.google.com/p/skia/source/detail?r=10366

[Stephen White, 2013-07-25 14:09:52]

reed@: PTAL. Some minor tweaks to the imagefilterscropped test, prior to
rebaselining.

[reed1, 2013-07-25 17:36:12]

lgtm

[Stephen White, 2013-07-25 18:08:18]

Committed patchset #1 manually as r10366 (presubmit successful).