Do not switch best connection on the controlled side too frequently

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 65932b9c9f0f400636fca9f558a2bc04b68456de..75cea2976f60f5f9c6a68b552ded01e7751c9819 100644
--- a/webrtc/p2p/base/port.h
+++ b/webrtc/p2p/base/port.h
@@ -178,7 +178,7 @@ class Port : public PortInterface, public rtc::MessageHandler,
   }
 
   // Identifies the generation that this port was created in.
-  uint32_t generation() { return generation_; }
+  uint32_t generation() const { return generation_; }
   void set_generation(uint32_t generation) { generation_ = generation; }
 
   const std::string username_fragment() const;
@@ -502,6 +502,8 @@ class Connection : public CandidatePairInterface,
   // side stops using it as well.
   bool pruned() const { return pruned_; }
   void Prune();
+  // Called when the state is WRITE_TIMEOUT but need to be reset and un-pruned.
+  void ResetWriteStateAndUnprune();
 
   bool use_candidate_attr() const { return use_candidate_attr_; }
   void set_use_candidate_attr(bool enable);
@@ -542,6 +544,8 @@ class Connection : public CandidatePairInterface,
   // Handles the binding request; sends a response if this is a valid request.
   void HandleBindingRequest(IceMessage* msg);
 
+  int64_t last_data_received() const { return last_data_received_; }
+
   // Debugging description of this connection
   std::string ToDebugId() const;
   std::string ToString() const;