skdiff: no longer skip .pdf files by default

skdiff: no longer skip .pdf files by default
Committed: https://code.google.com/p/skia/source/detail?r=4330

[epoger, 2012-05-31 20:15:13]

tiny change

[TomH, 2012-05-31 20:22:14]

Yup. Why?

[epoger, 2012-05-31 20:27:02]

On 2012/05/31 20:22:14, TomH wrote:
> Yup. Why?

Because I would like the buildbots to be able to use skdiff to detect whether gm
PDF test output has changed.

(And, given that the caller now was the ability to pass --match or --nomatch, I
don't see why PDFs should be ignored by default.)

[TomH, 2012-05-31 20:36:32]

LGTM