Expose a few gyp targets the test runner depends on to make it easier to move

BUG=324658
R=abarth@chromium.org

Review URL: https://codereview.chromium.org/118203004

git-svn-id: svn://svn.chromium.org/blink/trunk@164183 bbb929c8-8fbe-4397-9dbb-9b2b20218538