test_pictures.py will now look for render_pictures.exe and skdiff.exe

Before it was not and so was failing on Windows.

Review URL: https://codereview.appspot.com/6468043

git-svn-id: http://skia.googlecode.com/svn/trunk@5191 2bbb7eff-a529-9590-31e7-b0007b416f81
1 file changed