Support reftest-wait in web-platform-tests #5057
Merged
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The web-platform-tests (wpt) suite allows tests to control when the screenshot is
taken for reftests, based on the presence (and then absence) of a 'reftest-wait'
class on the root element.
To support this mechanism a JavaScript shim is inserted into wpt tests, which uses
existing TestRunner methods (waitUntilDone, notifyDone), combined with a
MutationObserver on the root element.
BUG=698256
Review-Url: https://codereview.chromium.org/2729863004
Cr-Commit-Position: refs/heads/master@{#455009}
This change is