Switch dartium to @patch annotation from patch.

sdk/lib/js/dartium/js_dartium.dart

 // Copyright (c) 2013, 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.
 
 /**
  * Support for interoperating with JavaScript.
  *
  * This library provides access to JavaScript objects from Dart, allowing
  * Dart code to get and set properties, and call methods of JavaScript objects
  * and invoke JavaScript functions. The library takes care of converting
@@ skipping 496 matching lines @@
   if (!declaration.isConstructor) {
     var jsName = _getJsMemberName(declaration);
     path = (path != null && path.isNotEmpty) ? "${path}.${jsName}" : jsName;
   }
   var name = memberName != null ? memberName : _getDeclarationName(declaration);
   if (declaration.isConstructor) {
     sb.write("factory");
   } else if (isStatic) {
     sb.write("static");
   } else {
-    sb.write("patch");
+    sb.write("@patch");
   }
   sb.write(" ");
   if (declaration.isGetter) {
     sb.write("get $name => ${_accessJsPath(path)};");
   } else if (declaration.isSetter) {
     sb.write("set $name(v) {\n"
         "  ${_JS_LIBRARY_PREFIX}.safeForTypedInterop(v);\n"
         "  return ${_accessJsPathSetter(path)};\n"
         "}\n");
   } else {
@@ skipping 194 matching lines @@
 """);
         }
 
         if (sbPatch.isNotEmpty) {
           var typeVariablesClause = '';
           if (!clazz.typeVariables.isEmpty) {
             typeVariablesClause =
                 '<${clazz.typeVariables.map((m) => mirrors.MirrorSystem.getName(m.simpleName)).join(',')}>';
           }
           sb.write("""
-patch class $className$typeVariablesClause {
+@patch class $className$typeVariablesClause {
 $sbPatch
 }
 """);
           if (isDom) {
             sb.write("""
 class $classNameImpl$typeVariablesClause extends $className implements ${_JS_LIBRARY_PREFIX}.JSObjectInterfacesDom {
   ${classNameImpl}.internal_() : super.internal_();
   get runtimeType => $className;
   toString() => super.toString();
 }
@@ skipping 134 matching lines @@
 class JSArrayImpl extends JSArray ${buildImplementsClause(implementsArray)} {
   JSArrayImpl.internal() : super.internal();
 }
 
 // Interfaces that are safe to slam on all DOM classes.
 // Adding implementsClause would be risky as it could contain Function which
 // is likely to break a lot of instanceof checks.
 abstract class JSObjectInterfacesDom $implementsClauseDom {
 }
 
-patch class JSObject {
+@patch class JSObject {
   static Type get instanceRuntimeType => JSObjectImpl;
 }
 
-patch class JSFunction {
+@patch class JSFunction {
   static Type get instanceRuntimeType => JSFunctionImpl;
 }
 
-patch class JSArray {
+@patch class JSArray {
   static Type get instanceRuntimeType => JSArrayImpl;
 }
 
 _registerAllJsInterfaces() {
   _registerJsInterfaces([${allTypes.join(", ")}]);
 }
 
 ''');
   ret..addAll(["dart:js", "JSInteropImpl.dart", sb.toString()]);
   return ret;
@@ skipping 788 matching lines @@
   } else {
     var ret = _interopCaptureThisExpando[f];
     if (ret == null) {
       // TODO(jacobr): we could optimize this.
       ret = JSFunction._createWithThis(f);
       _interopCaptureThisExpando[f] = ret;
     }
     return ret;
   }
 }