Right now the Chromium Mac pasteboard code is unimplemented. This is the WebCore side of the patch (the Chromium side is http://codereview.chromium.org/308001).
Created attachment 41517 [details] Patch
Comment on attachment 41517 [details] Patch LGTM. Darin should see this go by, I'll CC him. Seems a little odd for ChromiumBridge.h to include ImageSource.h, but OK.
I tried to mark the patch as Darin's for review but there was no edit box. Is that something new?
You should subscribe to webkit-dev if you aren't already. :) https://lists.webkit.org/pipermail/webkit-dev/2009-October/010091.html
r=me
landed as r49946