Reset TURN port NONCE when a new socket is created.

webrtc/p2p/base/turnserver.h

Index: webrtc/p2p/base/turnserver.h
diff --git a/webrtc/p2p/base/turnserver.h b/webrtc/p2p/base/turnserver.h
index 113bd4c4623d06c118a1b05ede79bceee2d72ad6..44a8b3827899904b514e8f23742361466a36713e 100644
--- a/webrtc/p2p/base/turnserver.h
+++ b/webrtc/p2p/base/turnserver.h
@@ -199,8 +199,14 @@ class TurnServer : public sigslot::has_slots<> {
   // Specifies the factory to use for creating external sockets.
   void SetExternalSocketFactory(rtc::PacketSocketFactory* factory,
                                 const rtc::SocketAddress& address);
+  // For testing only.
+  std::string SetTimestampForNextNonce(uint32_t timestamp) {
+    ts_for_next_nonce_ = timestamp;
+    return GenerateNonce(timestamp);
+  }
 
  private:
+  std::string GenerateNonce(uint32_t now) const;
   void OnInternalPacket(rtc::AsyncPacketSocket* socket, const char* data,
                         size_t size, const rtc::SocketAddress& address,
                         const rtc::PacketTime& packet_time);
@@ -221,7 +227,6 @@ class TurnServer : public sigslot::has_slots<> {
   bool CheckAuthorization(TurnServerConnection* conn, const StunMessage* msg,
                           const char* data, size_t size,
                           const std::string& key);
-  std::string GenerateNonce() const;
   bool ValidateNonce(const std::string& nonce) const;
 
   TurnServerAllocation* FindAllocation(TurnServerConnection* conn);
@@ -270,6 +275,10 @@ class TurnServer : public sigslot::has_slots<> {
 
   AllocationMap allocations_;
 
+  // For testing only. If this is non-zero, the next NONCE will be generated
+  // from this value, and it will be reset to 0 after generating the NONCE.
+  uint32_t ts_for_next_nonce_ = 0;
+
   friend class TurnServerAllocation;
 };