Change capture interface to use NTP capture time.

Move NTP functionality to Clock.

BUG=1563
TEST=trybots and vie_auto_test --automated

Review URL: https://webrtc-codereview.appspot.com/1313005

git-svn-id: http://webrtc.googlecode.com/svn/trunk/webrtc@3842 4adac7df-926f-26a2-2b94-8c16560cd09d
12 files changed