Add secure sockets to dart:io

runtime/bin/dartutils.h

Index: runtime/bin/dartutils.h
diff --git a/runtime/bin/dartutils.h b/runtime/bin/dartutils.h
index e660da33c726a2555ae8bb40f3f45a12044a86b8..cf84d1364f6a21ca70c86ae197151e24169069b3 100644
--- a/runtime/bin/dartutils.h
+++ b/runtime/bin/dartutils.h
@@ -105,10 +105,16 @@ class DartUtils {
   static bool PostNull(Dart_Port port_id);
   static bool PostInt32(Dart_Port port_id, int32_t value);
 
+  static Dart_Handle GetDartClass(const char* library_url,
+                                  const char* class_name);
   // Create a new Dart OSError object with the current OS error.
   static Dart_Handle NewDartOSError();
   // Create a new Dart OSError object with the provided OS error.
   static Dart_Handle NewDartOSError(OSError* os_error);
+  static Dart_Handle NewDartExceptionWithMessage(const char* library_url,
+                                                 const char* exception_name,
+                                                 const char* message);
+  static Dart_Handle NewDartArgumentError(const char* message);
 
   static void SetOriginalWorkingDirectory();