dart2js: Don't zone-register callbacks in async functions for every await.

pkg/compiler/lib/src/elements/modelx.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.
 
 library elements.modelx;
 
 import 'common.dart';
 import 'elements.dart';
 import '../constants/constant_constructors.dart';
 import '../constants/constructors.dart';
@@ skipping 994 matching lines @@
     if (origin != null) {
       result = origin.importScope[elementName];
       if (result != null) return result;
     }
     return null;
   }
 
   /** Look up a top-level element in this library, but only look for
     * non-imported elements. Returns null if no such element exist. */
   Element findLocal(String elementName) {
-    // TODO(johnniwinther): How to handle injected elements in the patch
-    // library?
     Element result = localScope.lookup(elementName);
+    if (result == null && isPatched) {
+      result = patch.localScope.lookup(elementName);
+    }

[Lasse Reichstein Nielsen, 2015/08/12 09:46:55]

Unrelated change?

[floitsch, 2015/08/12 13:30:46]

No. necessary, because we are looking up an element in a patch library.
Adding johnni as reviewer.

     if (result == null || result.library != this) return null;
     return result;
   }
 
   Element findExported(String elementName) {
     for (Link link = exports; !link.isEmpty; link = link.tail) {
       Element element = link.head;
       if (element.name == elementName) return element;
     }
     return null;
@@ skipping 1878 matching lines @@
   AstElement get definingElement;
 
   bool get hasResolvedAst => definingElement.hasTreeElements;
 
   ResolvedAst get resolvedAst {
     return new ResolvedAst(declaration,
         definingElement.node, definingElement.treeElements);
   }
 
 }