Just look at Chrome. On one hand, Google claims undying support for web standards, and on the other they're adding a bunch of non-standard features to their browser trying to get people tied in. This is very similar to MS and IE6 + ActiveX
What are these non-standard features? Are they open sourced? How hard would it be to fold them into another browser, especially one built on Webkit?
Dart, native client, Gears was in there for awhile.
Gears seems like a perfect example. It predated the HTML5 local storage when Google found such a tool useful. Now the standard's caught up and Gears has been yanked in favor of the standard. Dart and NaCl could conceivably lead to evil, but I like the history shown with Gears/HTML5.
Dart is not in any release of Chrome. You can download a special experimental Chromium release with Dart support but it is not in the nightly.
There's no reason that you can't both support standards and also offer non-standard technologies. The problem comes when you _don't_ support the standard but offer your own, non-standard implementation.