Implements RTP header dumping.

content/public/browser/render_process_host.h

Index: content/public/browser/render_process_host.h
diff --git a/content/public/browser/render_process_host.h b/content/public/browser/render_process_host.h
index 66a96eca5c6aca95d61c3ce68656669350f7c3fb..2c16f9fce097a516a70207e0e85ddf854bd05c7c 100644
--- a/content/public/browser/render_process_host.h
+++ b/content/public/browser/render_process_host.h
@@ -205,6 +205,23 @@ class CONTENT_EXPORT RenderProcessHost : public IPC::Sender,
   // process associated with this RenderProcessHost.
   virtual void SetWebRtcLogMessageCallback(
       base::Callback<void(const std::string&)> callback) = 0;
+
+  typedef base::Callback<void(const uint8* packet_header,
+                              size_t header_length,
+                              size_t packet_length,
+                              bool incoming)> WebRtcRtpPacketCallback;
+
+  typedef base::Callback<void(bool incoming, bool outgoing)>
+      WebRtcStopRtpDumpCallback;
+
+  // Starts passing RTP packets to |packet_callback| and returns the callback
+  // used to stop dumping. StartRtpDump must be called on the UI thread.
+  // The returned WebRtcStopRtpDumpCallback and |packet_callback| must be called
+  // on the UI thread too.

[jam, 2014/05/21 23:50:09]

nit: remove all mentions of UI thread in the comment, since by default any
object in content/public runs on UI thread unless otherwise stted

+  virtual WebRtcStopRtpDumpCallback StartRtpDump(
+      bool incoming,
+      bool outgoing,
+      const WebRtcRtpPacketCallback& packet_callback) = 0;
 #endif
 
   // Tells the ResourceDispatcherHost to resume a deferred navigation without