Add TransportContext class.

remoting/protocol/chromium_port_allocator.h

 // Copyright 2014 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 REMOTING_PROTOCOL_CHROMIUM_PORT_ALLOCATOR_H_
 #define REMOTING_PROTOCOL_CHROMIUM_PORT_ALLOCATOR_H_
 
 #include <set>
 
 #include "base/memory/ref_counted.h"
 #include "base/memory/scoped_ptr.h"
+#include "remoting/protocol/port_allocator_factory.h"
 #include "third_party/webrtc/p2p/client/httpportallocator.h"
 
 namespace net {
 class URLRequestContextGetter;
 }  // namespace net
 
 namespace remoting {
 namespace protocol {
 
 struct NetworkSettings;
 
-// An implementation of cricket::PortAllocator for libjingle that
-// uses Chromium's network stack and configures itself according
-// to the specified NetworkSettings.
+// An implementation of cricket::PortAllocator that uses Chromium's network
+// stack.
 class ChromiumPortAllocator : public cricket::HttpPortAllocatorBase {
  public:
   static scoped_ptr<ChromiumPortAllocator> Create(
-      const scoped_refptr<net::URLRequestContextGetter>& url_context,
-      const NetworkSettings& network_settings);
+      const scoped_refptr<net::URLRequestContextGetter>& url_context);
 
   ~ChromiumPortAllocator() override;
 
   // cricket::HttpPortAllocatorBase overrides.
   cricket::PortAllocatorSession* CreateSessionInternal(
       const std::string& content_name,
       int component,
       const std::string& ice_username_fragment,
       const std::string& ice_password) override;
 
  private:
   ChromiumPortAllocator(
       const scoped_refptr<net::URLRequestContextGetter>& url_context,
       scoped_ptr<rtc::NetworkManager> network_manager,
       scoped_ptr<rtc::PacketSocketFactory> socket_factory);
 
   scoped_refptr<net::URLRequestContextGetter> url_context_;
   scoped_ptr<rtc::NetworkManager> network_manager_;
   scoped_ptr<rtc::PacketSocketFactory> socket_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(ChromiumPortAllocator);
 };
 
+class ChromiumPortAllocatorFactory : public PortAllocatorFactory {
+ public:
+  ChromiumPortAllocatorFactory(
+      scoped_refptr<net::URLRequestContextGetter> url_request_context_getter);
+  ~ChromiumPortAllocatorFactory() override;
+
+   // PortAllocatorFactory interface.
+  scoped_ptr<cricket::HttpPortAllocatorBase> CreatePortAllocator() override;
+
+ private:
+  scoped_refptr<net::URLRequestContextGetter> url_request_context_getter_;
+
+  DISALLOW_COPY_AND_ASSIGN(ChromiumPortAllocatorFactory);
+};
+
 }  // namespace protocol
 }  // namespace remoting
 
 #endif  // REMOTING_HOST_HOST_PORT_ALLOCATOR_H_