Add information about rerun tests to json output.
Add information about rerun tests to json output.

BUG=374134
LOG=n
R=jkummerow@chromium.org

Review URL: https://codereview.chromium.org/364793004

git-svn-id: f98b9d40cb02301bc76fa9e1b46ee668158567fd@22147 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

UniversalFuture/moosh,UniversalFuture/moosh,UniversalFuture/moosh,UniversalFuture/moosh