This CL adds methods to manipulate RTP header extension, particularly

content/browser/renderer_host/p2p/socket_host.h

Index: content/browser/renderer_host/p2p/socket_host.h
diff --git a/content/browser/renderer_host/p2p/socket_host.h b/content/browser/renderer_host/p2p/socket_host.h
index 46fcde5b7d56a22a815f1a0cf850b2fa538c4252..0f01ba71ae4de4b6ca61af182daf846f1e027104 100644
--- a/content/browser/renderer_host/p2p/socket_host.h
+++ b/content/browser/renderer_host/p2p/socket_host.h
@@ -25,6 +25,22 @@ struct PacketOptions;
 namespace content {
 class P2PMessageThrottler;
 
+
+// Helper methods for processing a packet.

[Solis, 2014/02/27 09:36:10]

put these in a nested namespace:

namespace packet_processing_helpers {

obviating the need for a comment.

[Mallinath (Gone from Chromium), 2014/02/27 19:43:10]

Done.

+bool GetRtpPacketStartPositionAndLength(char* data, int length,

[Solis, 2014/02/27 09:36:10]

Only GetRtpPacketStartPositionAndLength() and MaybeUpdatePacketAbsSendTimeExtn()
need to be exposed at this level. The others should be private helpers in the
.cc.

[Mallinath (Gone from Chromium), 2014/02/27 19:43:10]

Done.

+                                        int* rtp_start_pos,
+                                        int* rtp_packet_length);
+bool ValidateRtpHeader(char* rtp, int length);
+
+void MaybeUpdatePacketAbsSendTimeExtn(char* data, int length,
+                                      const talk_base::PacketOptions& options);
+bool MaybeUpdateRtpAbsSendTimeExtn(char* rtp, int length,
+                                int extension_id);
+void UpdateAbsSendTimeExtnValue(char* data, int len);
+
+void MaybeUpdateRtpAuthTag(char* packet, int len,
+                           const talk_base::PacketOptions& options);
+
 // Base class for P2P sockets.
 class CONTENT_EXPORT P2PSocketHost {
  public:
@@ -53,7 +69,6 @@ class CONTENT_EXPORT P2PSocketHost {
   virtual bool SetOption(P2PSocketOption option, int value) = 0;
 
  protected:
-  friend class P2PSocketHostTcpTestBase;
 
   // TODO(mallinath) - Remove this below enum and use one defined in
   // libjingle/souce/talk/p2p/base/stun.h