f72943dadc6468c86620612ecb8612c673d42250

The intended trajectory of this patch is to abstract out all i/o for custom_call. The reason is that kjellander@ will need to be able to configure custom calls using flags, and using the same framework to gather all input gathering to a single place will make this a lot easier. This patch focuses on choices. The next will focus on field entries, like "enter ip address" or "enter port number." BUG= TEST=Manually tested all menus in custom call, ran new unit tests. Review URL: https://webrtc-codereview.appspot.com/757005 git-svn-id: http://webrtc.googlecode.com/svn/trunk@2758 4adac7df-926f-26a2-2b94-8c16560cd09d
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