We need to change the definition of "main thread" for Chromium on OSX. It does not match the DARWIN definition.
Created attachment 27494 [details] main thread definition change for Chromium/OSX
Comment on attachment 27494 [details] main thread definition change for Chromium/OSX r=me
http://trac.webkit.org/changeset/40811
With follow-up to fix the ChangeLog entry: http://trac.webkit.org/changeset/40822