Define Stream base classes

webrtc/video/audio_receive_stream.cc

Index: webrtc/video/audio_receive_stream.cc
diff --git a/webrtc/video/audio_receive_stream.cc b/webrtc/video/audio_receive_stream.cc
index 332d95b9032453b9a5d16b61fb85db9e2c0c2eaf..d8980a3922132161bacf865367245833ceb961ed 100644
--- a/webrtc/video/audio_receive_stream.cc
+++ b/webrtc/video/audio_receive_stream.cc
@@ -67,6 +67,15 @@ webrtc::AudioReceiveStream::Stats AudioReceiveStream::GetStats() const {
   return webrtc::AudioReceiveStream::Stats();
 }
 
+void AudioReceiveStream::Start() {
+}
+
+void AudioReceiveStream::Stop() {
+}
+
+void AudioReceiveStream::SignalNetworkState(NetworkState state) {
+}
+
 bool AudioReceiveStream::DeliverRtcp(const uint8_t* packet, size_t length) {
   return false;
 }