Add config to prune TURN ports

webrtc/p2p/client/basicportallocator.h

Index: webrtc/p2p/client/basicportallocator.h
diff --git a/webrtc/p2p/client/basicportallocator.h b/webrtc/p2p/client/basicportallocator.h
index 8ea66c431e76d560a6299c2831d77a1a83dfeb06..bd0483e3b80cd3a312f846e406e377506e758ca8 100644
--- a/webrtc/p2p/client/basicportallocator.h
+++ b/webrtc/p2p/client/basicportallocator.h
@@ -163,6 +163,10 @@ class BasicPortAllocatorSession : public PortAllocatorSession,
   void AddAllocatedPort(Port* port, AllocationSequence* seq,
                         bool prepare_address);
   void OnCandidateReady(Port* port, const Candidate& c);
+  void MaybeSignalPortReady(Port* port);
+  void MaybeSignalCandidatesReady(Port* port,
+                                  const std::vector<Candidate>& candidates);
+  bool IsPortInUse(Port* port) const;
   void OnPortComplete(Port* port);
   void OnPortError(Port* port);
   void OnProtocolEnabled(AllocationSequence* seq, ProtocolType proto);
@@ -191,6 +195,10 @@ class BasicPortAllocatorSession : public PortAllocatorSession,
   std::vector<PortData> ports_;
   uint32_t candidate_filter_ = CF_ALL;
 
+  typedef std::vector<Port*> PortArray;

[pthatcher1, 2016/06/27 20:35:55]

I'd prefer not to have a typedef and just have 

std::map<std::string, std::vector<Port*>>

[honghaiz3, 2016/06/28 01:49:26]

Done.

+  // The currently used turn ports keyed by the network names.
+  std::map<std::string, PortArray> turn_ports_in_use_by_network_names_;

[pthatcher1, 2016/06/27 20:35:55]

Why not just turn_ports_by_network_name?

[honghaiz3, 2016/06/28 01:49:26]

Removed this. 

+

[pthatcher1, 2016/06/27 20:35:55]

Actually, instead of having a separate map for turn ports that we are using or
not by network name, why not just use the ports inside of ports_?  And if we
deprecate a port, set the state in PortData of that port to STATE_DEPRECATED? 

[honghaiz3, 2016/06/28 01:49:26]

Done.

   friend class AllocationSequence;
 };