This CL adds methods to manipulate RTP header extension, particularly

content/browser/renderer_host/p2p/socket_host_udp.cc

Index: content/browser/renderer_host/p2p/socket_host_udp.cc
diff --git a/content/browser/renderer_host/p2p/socket_host_udp.cc b/content/browser/renderer_host/p2p/socket_host_udp.cc
index 7569bb3038ec88081ab354e12ae32e29d48901fe..db17c5f6f3fa3b4d8b565015cead895f122e2755 100644
--- a/content/browser/renderer_host/p2p/socket_host_udp.cc
+++ b/content/browser/renderer_host/p2p/socket_host_udp.cc
@@ -15,6 +15,7 @@
 #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 {
 
@@ -234,6 +235,8 @@ void P2PSocketHostUdp::DoSend(const PendingPacket& packet) {
       last_dscp_ = net::DSCP_NO_CHANGE;
     }
   }
+  packet_processing_helpers::ApplyPacketOptions(
+      packet.data->data(), packet.size, packet.packet_options, 0);
   int result = socket_->SendTo(
       packet.data.get(),
       packet.size,