[dart:io][windows] Implements RawSynchronousSocket

runtime/bin/sync_socket.h

Index: runtime/bin/sync_socket.h
diff --git a/runtime/bin/sync_socket.h b/runtime/bin/sync_socket.h
index b6eb784bc0b5db1a89296ae34871bd3943b02535..337a05374bc0221abe17d76e8db47e8df0a0dda6 100644
--- a/runtime/bin/sync_socket.h
+++ b/runtime/bin/sync_socket.h
@@ -32,8 +32,15 @@ class SynchronousSocket {
   static Dart_Handle GetSocketIdNativeField(Dart_Handle socket_obj,
                                             SynchronousSocket** socket);
 
+  static intptr_t Available(intptr_t fd);
+  static intptr_t GetPort(intptr_t fd);
+  static SocketAddress* GetRemotePeer(intptr_t fd, intptr_t* port);
+  static intptr_t Read(intptr_t fd, void* buffer, intptr_t num_bytes);
+  static intptr_t Write(intptr_t fd, const void* buffer, intptr_t num_bytes);
+
   static void ShutdownRead(intptr_t fd);
   static void ShutdownWrite(intptr_t fd);
+  static void Close(intptr_t fd);
 
  private:
   static const int kClosedFd = -1;