Interface RTCRtpReceiver and RTCPeerConnection.getReceivers() added.

third_party/WebKit/Source/modules/peerconnection/RTCRtpReceiver.cpp

+// Copyright 2017 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "modules/peerconnection/RTCRtpReceiver.h"
+
+namespace blink {
+
+RTCRtpReceiver::RTCRtpReceiver(std::unique_ptr<WebRTCRtpReceiver> receiver,
+                               MediaStreamTrack* track)
+    : m_receiver(std::move(receiver)), m_track(track) {
+  DCHECK(m_receiver);
+  DCHECK(m_track);
+  DCHECK_EQ(static_cast<String>(m_receiver->track().id()), m_track->id());
+}
+
+MediaStreamTrack* RTCRtpReceiver::track() const {
+  DCHECK_EQ(static_cast<String>(m_receiver->track().id()), m_track->id());
+  return m_track;
+}
+
+DEFINE_TRACE(RTCRtpReceiver) {
+  visitor->trace(m_track);
+}
+
+}  // namespace blink