GitLab

Root cause:
Our testharnessreport.js removes unnecessary text nodes in a callback registered
by add_completion_callback() [1]. The html5lib tests add other completion
callbacks to show failure reasons, and they run after the callback of
testharnessreport.js.  So, the failure reasons remain in *-expected.txt.

Resolution:
testharness.js doesn't provide a way to specify that "This callback must run at
the end of callbacks." So we delay the text nodes cleanup by setTimeout(done, 0).

[1] https://github.com/w3c/testharness.js/blob/master/docs/api.md#callback-api

BUG=527262

Review URL: https://codereview.chromium.org/1303313006

git-svn-id: svn://svn.chromium.org/blink/trunk@201628 bbb929c8-8fbe-4397-9dbb-9b2b20218538