Google Chrome Native Client deployment

Hi,

What does this new feature mean “Google Chrome Native Client deployment” (on http://unity3d.com/unity/whats-new/unity-3.5)?

Is there a Google Chrome module (or something) CONTAINED in Unity 3.5 or is it just possible now that Unity 3.5 can use such an EXTERNAL Google module?

Many thanks!

Google Native Client is a technology that allows you to run native code directly in the browser, which typically gives performance advantages over the usual HTML + JavaScript arrangement. You can find out more about Native Client on Wikipedia.