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Before this change it could happen that a large jump in timestamp (a jump not correlated to wall-clock change) caused the audio to go silent without recovering. The reason was that all incoming packets after the jump were considered too old compared to the last decoded packet, and were deleted. With CL changes two things: 1. If the only available packet in the buffer is an old packet, NetEq will do Expand instead of immediate reset. This is to avoid that one late packet triggers a reset. 2. Old packets are discarded only when the decision to decode a packet has been taken. This is to allow the buffer to grow and eventually flush if no decodable packet has been found for some time. This CL also includes a new unit test for this situation. BUG=3785 R=minyue@webrtc.org Review URL: https://webrtc-codereview.appspot.com/22709004 git-svn-id: http://webrtc.googlecode.com/svn/trunk@7255 4adac7df-926f-26a2-2b94-8c16560cd09d