Reland Use CopyOnWriteBuffer instead of Buffer to avoid unnecessary copies.

webrtc/api/webrtcsession.h

 /*
  *  Copyright 2012 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.
  */
 
@@ skipping 253 matching lines @@
                              const RtpParameters& parameters) override;
 
   // Implements DtmfProviderInterface.
   virtual bool CanInsertDtmf(const std::string& track_id);
   virtual bool InsertDtmf(const std::string& track_id,
                           int code, int duration);
   virtual sigslot::signal0<>* GetOnDestroyedSignal();
 
   // Implements DataChannelProviderInterface.
   bool SendData(const cricket::SendDataParams& params,
-                const rtc::Buffer& payload,
+                const rtc::CopyOnWriteBuffer& payload,
                 cricket::SendDataResult* result) override;
   bool ConnectDataChannel(DataChannel* webrtc_data_channel) override;
   void DisconnectDataChannel(DataChannel* webrtc_data_channel) override;
   void AddSctpDataStream(int sid) override;
   void RemoveSctpDataStream(int sid) override;
   bool ReadyToSendData() const override;
 
   // Returns stats for all channels of all transports.
   // This avoids exposing the internal structures used to track them.
   virtual bool GetTransportStats(SessionStats* stats);
@@ skipping 121 matching lines @@
 
   // Helper methods to create media channels.
   bool CreateVoiceChannel(const cricket::ContentInfo* content);
   bool CreateVideoChannel(const cricket::ContentInfo* content);
   bool CreateDataChannel(const cricket::ContentInfo* content);
 
   // Listens to SCTP CONTROL messages on unused SIDs and process them as OPEN
   // messages.
   void OnDataChannelMessageReceived(cricket::DataChannel* channel,
                                     const cricket::ReceiveDataParams& params,
-                                    const rtc::Buffer& payload);
+                                    const rtc::CopyOnWriteBuffer& payload);
 
   std::string BadStateErrMsg(State state);
   void SetIceConnectionState(PeerConnectionInterface::IceConnectionState state);
   void SetIceConnectionReceiving(bool receiving);
 
   bool ValidateBundleSettings(const cricket::SessionDescription* desc);
   bool HasRtcpMuxEnabled(const cricket::ContentInfo* content);
   // Below methods are helper methods which verifies SDP.
   bool ValidateSessionDescription(const SessionDescriptionInterface* sdesc,
                                   cricket::ContentSource source,
@@ skipping 86 matching lines @@
   PeerConnectionInterface::BundlePolicy bundle_policy_;
 
   // Declares the RTCP mux policy for the WebRTCSession.
   PeerConnectionInterface::RtcpMuxPolicy rtcp_mux_policy_;
 
   RTC_DISALLOW_COPY_AND_ASSIGN(WebRtcSession);
 };
 }  // namespace webrtc
 
 #endif  // WEBRTC_API_WEBRTCSESSION_H_