Add UINavigationController and settings bar button to AppRTCMobile.
The navigation controller is used to display the title of the app
and to feature the settings button.
This work is foundation for adding settings screen to the app (see webrtc:6473 for more info)
BUG=webrtc:6618, webrtc:6473
Review-Url: https://codereview.webrtc.org/2455363002
Cr-Original-Commit-Position: refs/heads/master@{#14816}
Cr-Mirrored-From: https://chromium.googlesource.com/external/webrtc
Cr-Mirrored-Commit: 6d6762cb0e236acd3231d1fba8ad590b43156d51
6 files changed
