This CL adds methods to manipulate RTP header extension, particularly

content/browser/renderer_host/p2p/socket_host_udp.cc

 // Copyright (c) 2012 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.
 
 #include "content/browser/renderer_host/p2p/socket_host_udp.h"
 
 #include "base/bind.h"
 #include "base/command_line.h"
 #include "base/debug/trace_event.h"
 #include "base/stl_util.h"
 #include "content/browser/renderer_host/p2p/socket_host_throttler.h"
 #include "content/common/p2p_messages.h"
 #include "content/public/common/content_switches.h"
 #include "ipc/ipc_sender.h"
 #include "net/base/io_buffer.h"
 #include "net/base/net_errors.h"
 #include "net/base/net_util.h"
+#include "third_party/libjingle/source/talk/base/asyncpacketsocket.h"
 
 namespace {
 
 // UDP packets cannot be bigger than 64k.
 const int kReadBufferSize = 65536;
 // Socket receive buffer size.
 const int kRecvSocketBufferSize = 65536;  // 64K
 
 // Defines set of transient errors. These errors are ignored when we get them
 // from sendto() or recvfrom() calls.
@@ skipping 28 matching lines @@
     const net::IPEndPoint& to,
     const std::vector<char>& content,
     const talk_base::PacketOptions& options,
     uint64 id)
     : to(to),
       data(new net::IOBuffer(content.size())),
       size(content.size()),
       packet_options(options),
       id(id) {
   memcpy(data->data(), &content[0], size);
-  if (!options.packet_time_params.srtp_auth_key.empty()) {
-    memcpy(&packet_options.packet_time_params.srtp_auth_key[0],
-           &options.packet_time_params.srtp_auth_key[0],
-           options.packet_time_params.srtp_auth_key.size());
-  }
 }
 
 P2PSocketHostUdp::PendingPacket::~PendingPacket() {
 }
 
 P2PSocketHostUdp::P2PSocketHostUdp(IPC::Sender* message_sender,
                                    int id,
                                    P2PMessageThrottler* throttler)
     : P2PSocketHost(message_sender, id),
       socket_(new net::UDPServerSocket(NULL, net::NetLog::Source())),
@@ skipping 154 matching lines @@
     int result = socket_->SetDiffServCodePoint(dscp);
     if (result == net::OK) {
       last_dscp_ = dscp;
     } else if (!IsTransientError(result) && last_dscp_ != net::DSCP_CS0) {
       // We receieved a non-transient error, and it seems we have
       // not changed the DSCP in the past, disable DSCP as it unlikely
       // to work in the future.
       last_dscp_ = net::DSCP_NO_CHANGE;
     }
   }
+  talk_base::PacketOptions options;
+  MaybeUpdatePacketAbsSendTimeExtn(packet.data->data(), packet.size, options);
   int result = socket_->SendTo(
       packet.data.get(),
       packet.size,
       packet.to,
       base::Bind(&P2PSocketHostUdp::OnSend, base::Unretained(this), packet.id));
 
   // sendto() may return an error, e.g. if we've received an ICMP Destination
   // Unreachable message. When this happens try sending the same packet again,
   // and just drop it if it fails again.
   if (IsTransientError(result)) {
@@ skipping 58 matching lines @@
     case P2P_SOCKET_OPT_DSCP:
       return (net::OK == socket_->SetDiffServCodePoint(
           static_cast<net::DiffServCodePoint>(value))) ? true : false;
     default:
       NOTREACHED();
       return false;
   }
 }
 
 }  // namespace content