New targets call:rtp_interfaces, call:rtp_receiver, call:rtp_sender.

BUG=webrtc:7135
TBR=sprang@webrtc.org

Review-Url: https://codereview.webrtc.org/2913143003
Cr-Commit-Position: refs/heads/master@{#18371}
diff --git a/webrtc/call/rtp_packet_sink_interface.h b/webrtc/call/rtp_packet_sink_interface.h
new file mode 100644
index 0000000..900ca35
--- /dev/null
+++ b/webrtc/call/rtp_packet_sink_interface.h
@@ -0,0 +1,26 @@
+/*
+ *  Copyright (c) 2017 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+#ifndef WEBRTC_CALL_RTP_PACKET_SINK_INTERFACE_H_
+#define WEBRTC_CALL_RTP_PACKET_SINK_INTERFACE_H_
+
+namespace webrtc {
+
+class RtpPacketReceived;
+
+// This class represents a receiver of an already parsed RTP packets.
+class RtpPacketSinkInterface {
+ public:
+  virtual ~RtpPacketSinkInterface() {}
+  virtual void OnRtpPacket(const RtpPacketReceived& packet) = 0;
+};
+
+}  // namespace webrtc
+
+#endif  // WEBRTC_CALL_RTP_PACKET_SINK_INTERFACE_H_