[webkit-dev] Experimental features review

[Michael Catanzaro]

No strong opinion from me here. I'm not familiar with how Safari's UI 
exposes some features but not others. In the GTK/WPE API, the features 
are not enumerable and only a few selected features are exposed at all, 
so that's not an issue for us.

I do think we have a semantic issue, though, if some features 
considered "experimental" are enabled by default. Not sure what the 
solution is. (And of course, if we change our experimental features 
policy, we'll want to ensure the comment in the WebPreferences.yaml 
file is updated.)

Michael