c4adabf967
Create the RtpReceiver.Observer which is a Java wrapper over the webrtc::RtpReceiverObserverInterface. The callback function onFirstPacketReceived will be called whenever the first audio or video packet it received. BUG=webrtc:6742 Review-Url: https://codereview.webrtc.org/2531333003 Cr-Commit-Position: refs/heads/master@{#15464}