[rfc][icedtea-web] Fix PR854: Resizing an applet several times causes 100% CPU load

[Adam Domurad]

Nasty bug with a simple fix. This has been reported since icedtea-web 1.1

See http://icedtea.classpath.org/bugzilla/show_bug.cgi?id=854. The 
reproducer is very easy to set up. Placing a print statement reveals 
that after two resize's, all of icedtea-web's worker threads are busy.

The waiting before was too fragile it seems. The version in the patch 
shouldn't dead-lock in any code-path. Everything works as expected with 
this patch (there really is no possible harm, too).

This should go into any branches that will be released again, IMHO. From 
the bug comments it seems this is quite a visible issue.

Thanks,
-Adam
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