Make CSSFontFace::setLoadStatus post a task
Setting the load status to LOADED results in the promise associated with the FontFace "loaded" property being resolved synchronously. The promise is resolved with a loaded FontFace object. This could result in script being executed in a forbidden scope.
Posting a task when the status is ERROR/LOADED prevents the promise from being resolved inside a forbidden scope and matches the spec ("When the load operation completes, successfully or not, queue a task to run the following steps synchronously", see https://drafts.csswg.org/css-font-loading/#font-face-load).
BUG=663476
Review-Url: https://codereview.chromium.org/2610593002
Cr-Commit-Position: refs/heads/master@{#443596}
3 files changed
