ExtensionSidebarPane.setPage() will set content of the sidebar to page specified.
Created attachment 87851 [details]
Comment on attachment 87851 [details]
ChangeLog entry is missing, otherwise looks good.
Created attachment 88041 [details]
Oops. Added ChangeLog entries.
http://trac.webkit.org/changeset/82806 might have broken SnowLeopard Intel Release (Tests)
The following tests are not passing:
Manually committed as r82206: http://trac.webkit.org/changeset/82806
Follow-up fix in r82814: http://trac.webkit.org/changeset/82814