[wpe-webkit] Popups and Text Input Support

[Joshua Watt]

Hello,

I've been tasked with getting WPE WebKit to render popup menus 
(specifically, the ones that would appear with a drop down input, but it 
could also be extended to the context menu) and also to get the text 
input support working (e.g. the on screen keyboard that weston uses to 
allow text input with a touch screen).

I've already done most of this work once a few years ago back when WPE 
was still a github project, but the patches (sadly) never merged. I 
think that was around when the transition to be a proper WebKit port in 
SVN occured and they got lost in the shuffle. I would really like to get 
the patches upstream this time so that I don't have to do all this work 
a third time :)

The first patch I have so far is to add popup support to libwpe 
(https://github.com/WebPlatformForEmbedded/libwpe/pull/57), and I have 
corresponding patch(es) to WebKit to make it use and render them on drop 
down inputs, although I haven't pushed them to bugzilla yet.

If there is any long-term strategy (or anyone that wants to help me work 
on this!) I'd like to hear from you.

Thanks,

Joshua Watt