or: how creating a SplayTreeSet<String> leads to fixing a bunch of stuff R=vsm@google.com Review URL: https://codereview.chromium.org/1058653002
R=vsm@google.com Review URL: https://codereview.chromium.org/1050723002
test tools are from https://github.com/webcomponents/webcomponentsjs/tree/master/tests/tools R=vsm@google.com Review URL: https://chromereviews.googleplex.com/151127013