Do not switch best connection on the controlled side too frequently

webrtc/p2p/base/port.h

 /*
  *  Copyright 2004 The WebRTC Project Authors. All rights reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
  *  tree. An additional intellectual property rights grant can be found
  *  in the file PATENTS.  All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
@@ skipping 160 matching lines @@
   void set_component(int component) { component_ = component; }
 
   bool send_retransmit_count_attribute() const {
     return send_retransmit_count_attribute_;
   }
   void set_send_retransmit_count_attribute(bool enable) {
     send_retransmit_count_attribute_ = enable;
   }
 
   // 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;
   const std::string& password() const { return password_; }
 
   // May be called when this port was initially created by a pooled
   // PortAllocatorSession, and is now being assigned to an ICE transport.
   // Updates the information for candidates as well.
   void SetIceParameters(int component,
                         const std::string& username_fragment,
@@ skipping 343 matching lines @@
     return last_ping_response_received_;
   }
 
   // Called whenever a valid ping is received on this connection.  This is
   // public because the connection intercepts the first ping for us.
   int64_t last_ping_received() const { return last_ping_received_; }
   void ReceivedPing();
   // 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;
   std::string ToSensitiveString() const;
   // Prints pings_since_last_response_ into a string.
   void PrintPingsSinceLastResponse(std::string* pings, size_t max);
 
   bool reported() const { return reported_; }
   void set_reported(bool reported) { reported_ = reported;}
 
@@ skipping 119 matching lines @@
            const rtc::PacketOptions& options) override;
   int GetError() override { return error_; }
 
  private:
   int error_ = 0;
 };
 
 }  // namespace cricket
 
 #endif  // WEBRTC_P2P_BASE_PORT_H_