gm: remove --diffPath option and all other pixel diff functionality.
If you want pixel diffs, you need to run skdiff instead; from now on,
gm will only tell you WHETHER the images differed (not HOW they differed).
Review URL: https://codereview.appspot.com/7064047

git-svn-id: http://skia.googlecode.com/svn/trunk@7093 2bbb7eff-a529-9590-31e7-b0007b416f81
4 files changed