Create jsondiff tool to capture diffs between two JSON expectations files.
This will be used to view diffs before committing rebaselines, or to review
exactly what changed between two baseline revisions in the past.

Part of Step 3 in https://goto.google.com/ChecksumTransitionDetail

R=scroggo@google.com

Review URL: https://codereview.chromium.org/18103005

git-svn-id: http://skia.googlecode.com/svn/trunk@9878 2bbb7eff-a529-9590-31e7-b0007b416f81
9 files changed