57cc74e32c
Introduces a new capture class derived from cricket::VideoCapturer that provides the ability to switch cameras and updates AppRTCDemo to use it. Some future work pending to clean up AppRTCDemo UI. BUG=4070 R=magjed@webrtc.org Review URL: https://webrtc-codereview.appspot.com/48279005 Cr-Commit-Position: refs/heads/master@{#9137}