Interface RTCRtpReceiver and RTCPeerConnection.getReceivers() added.

third_party/WebKit/public/platform/WebRTCRtpReceiver.h

+// 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.
+
+#ifndef WebRTCRtpReceiver_h
+#define WebRTCRtpReceiver_h
+
+#include "WebCommon.h"
+#include "WebString.h"
+
+namespace blink {
+
+class WebMediaStreamTrack;
+
+// Implementations of this interface keep the corresponding WebRTC-layer
+// receiver alive through reference counting. Multiple |WebRTCRtpReceiver|s
+// could reference the same receiver, see |id|.
+// https://w3c.github.io/webrtc-pc/#rtcrtpreceiver-interface
+class BLINK_PLATFORM_EXPORT WebRTCRtpReceiver {
+ public:
+  virtual ~WebRTCRtpReceiver();
+
+  // Two |WebRTCRtpReceiver|s referencing the same WebRTC-layer receiver have
+  // the same |id|.
+  virtual uintptr_t id() const = 0;
+  virtual const WebMediaStreamTrack& track() const = 0;
+};
+
+}  // namespace blink
+
+#endif  // WebRTCRtpReceiver_h