Sync-packet insertion into NetEq4. This is related to r3883 & r4052 for NetEq 3.

BUG=
R=henrik.lundin@webrtc.org

Review URL: https://webrtc-codereview.appspot.com/2099004

git-svn-id: http://webrtc.googlecode.com/svn/trunk/webrtc@4850 4adac7df-926f-26a2-2b94-8c16560cd09d
7 files changed