Use metadata annotation @patch for patch classes

runtime/lib/developer.dart

Index: runtime/lib/developer.dart
diff --git a/runtime/lib/developer.dart b/runtime/lib/developer.dart
index f7b45f0b46ded975261462dc721e7a845d306a33..ec3d38b621c6552ec0abbf0b5b19934b450d1e11 100644
--- a/runtime/lib/developer.dart
+++ b/runtime/lib/developer.dart
@@ -4,19 +4,19 @@
 
 import 'dart:isolate';
 
-patch bool debugger({bool when: true,
+@patch bool debugger({bool when: true,
                      String message}) native "Developer_debugger";
 
-patch Object inspect(Object object) native "Developer_inspect";
+@patch Object inspect(Object object) native "Developer_inspect";
 
-patch void log(String message,
-               {DateTime time,
-                int sequenceNumber,
-                int level: 0,
-                String name: '',
-                Zone zone,
-                Object error,
-                StackTrace stackTrace}) {
+@patch void log(String message,
+                {DateTime time,
+                 int sequenceNumber,
+                 int level: 0,
+                 String name: '',
+                 Zone zone,
+                 Object error,
+                 StackTrace stackTrace}) {
   if (message is! String) {
     throw new ArgumentError(message, "message", "Must be a String");
   }
@@ -52,13 +52,13 @@ _log(String message,
      Object error,
      StackTrace stackTrace) native "Developer_log";
 
-patch void _postEvent(String eventKind, String eventData)
+@patch void _postEvent(String eventKind, String eventData)
     native "Developer_postEvent";
 
-patch ServiceExtensionHandler _lookupExtension(String method)
+@patch ServiceExtensionHandler _lookupExtension(String method)
     native "Developer_lookupExtension";
 
-patch _registerExtension(String method, ServiceExtensionHandler handler)
+@patch _registerExtension(String method, ServiceExtensionHandler handler)
     native "Developer_registerExtension";
 
 // This code is only invoked when there is no other Dart code on the stack.