Is there a list of which Steam games support Oculus Rift?

Since the "VR Support" list doesn't include the games that have the "Oculus Rift" banner (as shown on your link to Doorways: Chapter 1 and 2) and the fact that none of the games returned by that search query have the same banner, it would seem that this is functionality that has not yet been fully implemented and/or it could be for games supporting Valve's own upcoming virtual reality hardware.

However, there are a couple of manually maintained lists available;

• This one on Steam contains quite a few more games than are returned by the "VR Support" search query but doesn't seem to be actively updated anymore,
• This one on Wikipedia is about games in general that support the Oculus Rift, not necessarily games specific to Steam,
• Not specific to Steam, but RiftEnabled is a wiki-like site that keeps track of Rift support in games

There is also the Oculus Rift Owners Group which may help you find out further information on which games directly support the Oculus Rift, but mainly seems to be full of tweaking games that don't officially support it yet.

With the new addition of tags in steam, there is an Oculus Rift tag that seems to be used. http://store.steampowered.com/tag/en/Oculus%20Rift/

Note that tags are in beta, and are entered by users themselves, so they are no guarantee but it seems to be valid.