Can Object.observe() and GWT play together?

As Chrome 36 was just released and included built-in support for Object.observe(), I thought I'd test it out, but I got stuck when I wanted it to observe java-objects instead of plain javascript-objects. 

I would have a list of some domain objects in an instance variable, like:

    List<Contact> contacts; 

where Contact would have name and address objects and so on.  

I would then like to use something like:

   Object.observe(<something>, function(changes) { <call back to java code to notify object has changed> });  

That "something" should point to some contact's address object (for example)

The callback is working just fine when observing a plain javascript object, but I can't figure out how to get it working with my instance variable. 

Am I missing something simple here? 

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