They do have that, it's "with Google". Android phones that follow Google's platform guidelines can put a "with Google" logo on the device, otherwise they cannot.
The problem is that the marketing is all around "Android", but the enforcement is around "with Google". So vendors that ship garbage can still ride Android's marketing coattails (and dirty them).
>'with Google' phones have been optimised for use of Google Mobile Services, providing easy access to Search, Voice Search, Google Talk, Google Maps, Gmail, Sync, YouTube and Android Market (where available).
And normal, non-branded phones are defined as:
>All phones in the Google Phone Gallery come with Android Market and Google Mobile Services such as Search, Google Maps and Gmail pre-installed.
What's the difference? There do not appear to be any real UX-related requirements, because Android 2.2 and 2.3 phones have the branding, some phones that use HTC sense have the branding(and others don't). Also, the Droid Incredible has the branding, but the Incredible 2 does not!
