Adding "adapter" ORTC objects on top of ChannelManager/BaseChannel/etc.

webrtc/api/ortc/rtptransportcontrollerinterface.h

Index: webrtc/api/ortc/rtptransportcontrollerinterface.h
diff --git a/webrtc/api/ortc/rtptransportcontrollerinterface.h b/webrtc/api/ortc/rtptransportcontrollerinterface.h
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+++ b/webrtc/api/ortc/rtptransportcontrollerinterface.h
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+/*
+ *  Copyright 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_API_ORTC_RTPTRANSPORTCONTROLLERINTERFACE_H_
+#define WEBRTC_API_ORTC_RTPTRANSPORTCONTROLLERINTERFACE_H_
+
+#include <vector>
+
+#include "webrtc/api/ortc/rtptransportinterface.h"
+
+namespace webrtc {
+
+class RtpTransportControllerAdapter;
+
+// Used to group RTP transports between a local endpoint and the same remote
+// endpoint, for the purpose of sharing bandwidth estimation and other things.
+//
+// Comparing this to the PeerConnection model, non-budled audio/video would use
+// two RtpTransports with a single RtpTransportController, whereas bundled
+// media would use a single RtpTransport, and two PeerConnections would use
+// independent RtpTransportControllers.
+//
+// RtpTransports are associated with this controller when they're created, by
+// passing the controller into OrtcFactory's relevant "CreateRtpTransport"
+// method. When a transport is destroyed, it's automatically disassociated.
+// GetTransports returns all currently associated transports.
+//
+// This is the RTP equivalent of "IceTransportController" in ORTC; RtpTransport
+// is to RtpTransportController as IceTransport is to IceTransportController.
+class RtpTransportControllerInterface {
+ public:
+  virtual ~RtpTransportControllerInterface() {}
+
+  // Returns all transports associated with this controller (see explanation
+  // above). No ordering is guaranteed.
+  virtual std::vector<RtpTransportInterface*> GetTransports() const = 0;
+
+ protected:
+  // Only for internal use. Returns a pointer to an internal interface, for use
+  // by the implementation.
+  virtual RtpTransportControllerAdapter* GetInternal() = 0;
+
+  // Classes that can use this internal interface.
+  friend class RtpTransportAdapter;
+};
+
+}  // namespace webrtc
+
+#endif  // WEBRTC_API_ORTC_RTPTRANSPORTCONTROLLERINTERFACE_H_