Use metadata annotation @patch for patch classes

runtime/bin/secure_socket_patch.dart

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
-patch class SecureSocket {
-  /* patch */ factory SecureSocket._(RawSecureSocket rawSocket) =>
+@patch class SecureSocket {
+  /* @patch */ factory SecureSocket._(RawSecureSocket rawSocket) =>
       new _SecureSocket(rawSocket);
 }
 
 
-patch class _SecureFilter {
-  /* patch */ factory _SecureFilter() => new _SecureFilterImpl();
+@patch class _SecureFilter {
+  /* @patch */ factory _SecureFilter() => new _SecureFilterImpl();
 }
 
-patch class X509Certificate {
-  /* patch */ factory X509Certificate._() => new _X509CertificateImpl();
+@patch class X509Certificate {
+  /* @patch */ factory X509Certificate._() => new _X509CertificateImpl();
 }
 
 class _SecureSocket extends _Socket implements SecureSocket {
   _SecureSocket(RawSecureSocket raw) : super(raw);
 
   void set onBadCertificate(bool callback(X509Certificate certificate)) {
     if (_raw == null) {
       throw new StateError("onBadCertificate called on destroyed SecureSocket");
     }
     _raw.onBadCertificate = callback;
@@ skipping 81 matching lines @@
 
   void registerHandshakeCompleteCallback(Function handshakeCompleteHandler)
       native "SecureSocket_RegisterHandshakeCompleteCallback";
 
   // This is a security issue, as it exposes a raw pointer to Dart code.
   int _pointer() native "SecureSocket_FilterPointer";
 
   List<_ExternalBuffer> buffers;
 }
 
-patch class SecurityContext {
-  /* patch */ factory SecurityContext() {
+@patch class SecurityContext {
+  /* @patch */ factory SecurityContext() {
     return new _SecurityContext();
   }
 
-  /* patch */ static SecurityContext get defaultContext {
+  /* @patch */ static SecurityContext get defaultContext {
     return _SecurityContext.defaultContext;
   }
 
-  /* patch */ static bool get alpnSupported {
+  /* @patch */ static bool get alpnSupported {
     return _SecurityContext.alpnSupported;
   }
 }
 
 class _SecurityContext
     extends NativeFieldWrapperClass1
     implements SecurityContext {
   _SecurityContext() {
     _createNativeContext();
   }
@@ skipping 60 matching lines @@
     return new DateTime.fromMillisecondsSinceEpoch(_startValidity(),
                                                    isUtc: true);
   }
   DateTime get endValidity {
     return new DateTime.fromMillisecondsSinceEpoch(_endValidity(),
                                                    isUtc: true);
   }
   int _startValidity() native "X509_StartValidity";
   int _endValidity() native "X509_EndValidity";
 }