I've been wondering about web crypto, and how you can actually be protected from say Google getting your content before it's actually encrypted in the browser.

I've been wondering about web crypto, and how you can actually be protected from say Google getting your content before it's actually encrypted in the browser. Could Chrome's recent "packaged apps" help with that? Maybe if that part of the web app/extension was actually native/offline (but still inside the browser), it would be secure against that. Of course then you have to start wondering whether Google didn't implement a backdoor inside the browser itself...but maybe the fact that Chromium is open source can help there.