Increase the stun ping interval.

webrtc/p2p/base/port.h

Index: webrtc/p2p/base/port.h
diff --git a/webrtc/p2p/base/port.h b/webrtc/p2p/base/port.h
index 937f3cd0284f058e12fc6a47848ac0ad8ec98204..f254a6621a243fd724337895cc9fd8fe4441f95f 100644
--- a/webrtc/p2p/base/port.h
+++ b/webrtc/p2p/base/port.h
@@ -591,6 +591,9 @@ class Connection : public CandidatePairInterface,
   // response in milliseconds
   int64_t last_received() const;
 
+  // If the connection need to send Ping at fast rate.

[pthatcher1, 2016/05/27 17:36:31]

Ping => pings
at fast rate => at a fast rate

[Taylor Brandstetter, 2016/05/27 20:11:00]

also need => needs

+  bool NeedToPingFast();

[pthatcher1, 2016/05/27 17:36:31]

I'd prefer to simply expose pings_sent() as a method and then let
p2ptransportchannel do the logic of choosing fast vs. slow.  That way all the
logic is in one place.

[Taylor Brandstetter, 2016/05/27 20:11:00]

I agree with this. P2PTransportChannel can have a helper function
"NeedToPingFast(Connection*)".

+
  protected:
   enum { MSG_DELETE = 0, MSG_FIRST_AVAILABLE };
 
@@ -656,6 +659,9 @@ class Connection : public CandidatePairInterface,
   int receiving_timeout_;
   int64_t time_created_ms_;
 
+  // Number of pings we have sent.
+  int ping_sent_count_;
+
   friend class Port;
   friend class ConnectionRequest;
 };