[Webkit-unassigned] [Bug 238580] REGRESSION(r292072): [ Mac iOS ] http/tests/webAPIStatistics/canvas-read-and-write-data-collection.html is a constant text failure

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=238580

--- Comment #7 from Myles C. Maxfield <mmaxfield at apple.com> ---
I understand what's happening now:

1. InjectedBundle::initialize() runs, which calls activateFonts() (which installs WebKit's testing fonts for the local (web) process. This queues up a notification (which is asynchronously delivered).
2. WebProcess::createWebPage() runs, which loads a dummy empty page, which uses -webkit-standard, and so we end up calling realizeNextFallback() and therefore WebResourceLoadObserver::logFontLoad(). This populates some dummy statistics in the WebResourceLoadObserver under the domain "nullOrigin".
3. InjectedBundle::beginTesting() runs, which calls WebResourceLoadObserver::clearState(). The previously-recorded statistics are now gone.
4. The pending notification gets delivered. The page is still the dummy page. The style recalc ends up calling realizeNextFallback() and therefore WebResourceLoadObserver::logFontLoad(). This populates some more dummy statistics in the WebResourceLoadObserver under the domain "nullOrigin". Before r292072 this didn't use to happen.
5. The test runs, loads some stuff, and dumps the contents of the WebResourceLoadObserver. The contents contain both statistics that the test intentionally created, as well as the dummy statistics that was placed there by the layout the notification caused.

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