[webkit-reviews] review requested: [Bug 143547] Add a debug assertion that will fire if we try to paint layer contents on a background thread : [Attachment 250401] Patch

[bugzilla-daemon at webkit.org]

Simon Fraser (smfr) <simon.fraser at apple.com> has asked	for review:
Bug 143547: Add a debug assertion that will fire if we try to paint layer
contents on a background thread
https://bugs.webkit.org/show_bug.cgi?id=143547

Attachment 250401: Patch

https://bugs.webkit.org/attachment.cgi?id=250401&action=review