Add audio support in WebrtcConnectionToHost, audio unittest

remoting/protocol/webrtc_transport.h

 // Copyright 2015 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_WEBRTC_TRANSPORT_H_
 #define REMOTING_PROTOCOL_WEBRTC_TRANSPORT_H_
 
 #include <memory>
 #include <string>
 
@@ skipping 53 matching lines @@
   WebrtcTransport(rtc::Thread* worker_thread,
                   scoped_refptr<TransportContext> transport_context,
                   EventHandler* event_handler);
   ~WebrtcTransport() override;
 
   webrtc::PeerConnectionInterface* peer_connection();
   webrtc::PeerConnectionFactoryInterface* peer_connection_factory();
   WebrtcDummyVideoEncoderFactory* video_encoder_factory() {
     return video_encoder_factory_;
   }
+  WebrtcAudioModule* audio_module();
 
   // Creates outgoing data channel. The channel is created in CONNECTING state.
   // The caller must wait for OnMessagePipeOpen() notification before sending
   // any messages.
   std::unique_ptr<MessagePipe> CreateOutgoingChannel(const std::string& name);
 
   // Transport interface.
   void Start(Authenticator* authenticator,
              SendTransportInfoCallback send_transport_info_callback) override;
   bool ProcessTransportInfo(buzz::XmlElement* transport_info) override;
@@ skipping 32 matching lines @@
   void OnIceCandidate(const webrtc::IceCandidateInterface* candidate);
 
   void RequestNegotiation();
   void SendOffer();
   void EnsurePendingTransportInfoMessage();
   void SendTransportInfo();
   void AddPendingCandidatesIfPossible();
 
   base::ThreadChecker thread_checker_;
 
-  rtc::Thread* worker_thread_;
   scoped_refptr<TransportContext> transport_context_;
   EventHandler* event_handler_ = nullptr;
   SendTransportInfoCallback send_transport_info_callback_;
 
   crypto::HMAC handshake_hmac_;
 
   std::unique_ptr<PeerConnectionWrapper> peer_connection_wrapper_;
 
   WebrtcDummyVideoEncoderFactory* video_encoder_factory_;
 
   bool negotiation_pending_ = false;
 
   bool connected_ = false;
 
   std::unique_ptr<buzz::XmlElement> pending_transport_info_message_;
   base::OneShotTimer transport_info_timer_;
 
   ScopedVector<webrtc::IceCandidateInterface> pending_incoming_candidates_;
 
   base::WeakPtrFactory<WebrtcTransport> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(WebrtcTransport);
 };
 
 }  // namespace protocol
 }  // namespace remoting
 
 #endif  // REMOTING_PROTOCOL_WEBRTC_TRANSPORT_H_