Support for remote audio into tracks

talk/app/webrtc/remoteaudiotrack.cc

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 #include "talk/app/webrtc/remoteaudiotrack.h"
+
+#include "talk/app/webrtc/remoteaudiosource.h"
+
+using rtc::scoped_refptr;
+
+namespace webrtc {
+
+// static
+scoped_refptr<RemoteAudioTrack> RemoteAudioTrack::Create(
+    const std::string& id,
+    const scoped_refptr<RemoteAudioSource>& source) {
+  return new rtc::RefCountedObject<RemoteAudioTrack>(id, source);
+}
+
+RemoteAudioTrack::RemoteAudioTrack(
+    const std::string& label,
+    const scoped_refptr<RemoteAudioSource>& source)
+    : MediaStreamTrack<AudioTrackInterface>(label), audio_source_(source) {}
+
+std::string RemoteAudioTrack::kind() const {
+  return MediaStreamTrackInterface::kAudioKind;
+}
+
+AudioSourceInterface* RemoteAudioTrack::GetSource() const {
+  return audio_source_.get();
+}
+
+void RemoteAudioTrack::AddSink(AudioTrackSinkInterface* sink) {
+  audio_source_->AddSink(sink);
+}
+
+void RemoteAudioTrack::RemoveSink(AudioTrackSinkInterface* sink) {
+  audio_source_->RemoveSink(sink);
+}
+
+bool RemoteAudioTrack::GetSignalLevel(int* level) {
+  return false;
+}
+
+scoped_refptr<AudioProcessorInterface> RemoteAudioTrack::GetAudioProcessor() {

[perkj_webrtc, 2015/12/10 12:24:05]

Are these not used for remote audio? Only local? 

[tommi, 2015/12/10 22:37:25]

Local only. There's a todo to remove it but it's being used in a few places
still.  There's no need to override it here, so I removed it.

+  return nullptr;
+}
+
+}  // namespace webrtc