Revert "Get rid of testlistjson query parameter."

This reverts r180005. Turns out that the android JSONResultsGenerator
really does depend on testlistjson not having the results and times. :(

TBR=szager@chromium.org

Review URL: https://codereview.chromium.org/459263002

git-svn-id: svn://svn.chromium.org/blink/trunk@180010 bbb929c8-8fbe-4397-9dbb-9b2b20218538