Add a close method to sockets

src/platform.h

 // Copyright 2006-2008 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 423 matching lines @@
   virtual ~Socket() {}
 
   // Server initialization.
   virtual bool Bind(const int port) = 0;
   virtual bool Listen(int backlog) const = 0;
   virtual Socket* Accept() const = 0;
 
   // Client initialization.
   virtual bool Connect(const char* host, const char* port) = 0;
 
+  // Close.
+  virtual bool Close() = 0;
+
   // Data Transimission
   virtual int Send(const char* data, int len) const = 0;
   virtual int Receive(char* data, int len) const = 0;
 
   virtual bool IsValid() const = 0;
 
   static bool Setup();
   static int LastError();
   static uint16_t HToN(uint16_t value);
   static uint16_t NToH(uint16_t value);
@@ skipping 50 matching lines @@
   bool active_;
   PlatformData* data_;  // Platform specific data.
   DISALLOW_IMPLICIT_CONSTRUCTORS(Sampler);
 };
 
 #endif  // ENABLE_LOGGING_AND_PROFILING
 
 } }  // namespace v8::internal
 
 #endif  // V8_PLATFORM_H_