79980897890aa0563024a58ccd580694ed747804

This adds a UI icon for switching between the front and back camera. This cl adds the possibility to change between the front and back camera while in a call or before the other end have connected. BUG=3786 R=glaznev@webrtc.org Review URL: https://webrtc-codereview.appspot.com/23219004 git-svn-id: http://webrtc.googlecode.com/svn/trunk@7553 4adac7df-926f-26a2-2b94-8c16560cd09d
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