Create a self test for skimage.

Runs skimage twice: once to create an expectations file, and a
second time comparing against the file. Uses the files in
resources as test files.

R=epoger@google.com

Review URL: https://codereview.chromium.org/14969007

git-svn-id: http://skia.googlecode.com/svn/trunk@9123 2bbb7eff-a529-9590-31e7-b0007b416f81
3 files changed