Adding OrtcFactory, and changing UdpTransport to match current plan.

webrtc/api/ortcfactory.h

Index: webrtc/api/ortcfactory.h
diff --git a/webrtc/api/ortcfactory.h b/webrtc/api/ortcfactory.h
new file mode 100644
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+++ b/webrtc/api/ortcfactory.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_ORTCFACTORY_H_
+#define WEBRTC_API_ORTCFACTORY_H_
+
+#include <memory>
+
+#include "webrtc/api/ortcfactoryinterface.h"
+#include "webrtc/base/constructormagic.h"
+
+namespace webrtc {
+
+// Implementation of OrtcFactoryInterface.
+//
+// See ortcfactoryinterface.h for documentation.
+class OrtcFactory : public OrtcFactoryInterface {
+ public:
+  OrtcFactory(rtc::Thread* network_thread,
+              rtc::Thread* signaling_thread,
+              rtc::NetworkManager* network_manager,
+              rtc::PacketSocketFactory* socket_factory);
+  ~OrtcFactory() override;
+  std::unique_ptr<UdpTransportInterface>
+  CreateUdpTransport(int family, uint16_t min_port, uint16_t max_port) override;
+
+  rtc::Thread* network_thread() { return network_thread_; }
+  rtc::Thread* worker_thread() { return owned_worker_thread_.get(); }
+  rtc::Thread* signaling_thread() { return signaling_thread_; }
+
+ private:
+  rtc::Thread* network_thread_;
+  rtc::Thread* signaling_thread_;
+  rtc::NetworkManager* network_manager_;
+  rtc::PacketSocketFactory* socket_factory_;
+  // If we created/own the objects above, these will be non-null and thus will
+  // be released automatically upon destruction.
+  std::unique_ptr<rtc::Thread> owned_network_thread_;
+  std::unique_ptr<rtc::Thread> owned_worker_thread_;
+  bool wraps_signaling_thread_ = false;
+  std::unique_ptr<rtc::NetworkManager> owned_network_manager_;
+  std::unique_ptr<rtc::PacketSocketFactory> owned_socket_factory_;
+  RTC_DISALLOW_COPY_AND_ASSIGN(OrtcFactory);
+};
+
+BEGIN_OWNED_PROXY_MAP(OrtcFactory)
+  PROXY_SIGNALING_THREAD_DESTRUCTOR()
+  PROXY_METHOD3(std::unique_ptr<UdpTransportInterface>,
+                CreateUdpTransport,
+                int,
+                uint16_t,
+                uint16_t)
+END_PROXY_MAP()
+
+}  // namespace webrtc
+
+#endif  // WEBRTC_API_ORTCFACTORY_H_