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

pkg/compiler/lib/src/elements/modelx.dart

Index: pkg/compiler/lib/src/elements/modelx.dart
diff --git a/pkg/compiler/lib/src/elements/modelx.dart b/pkg/compiler/lib/src/elements/modelx.dart
index 275ba80e4cf9d6588921bdf07d792b9bb1f2c92a..3242982b4330b7347c9171439da7e399dc9ac426 100644
--- a/pkg/compiler/lib/src/elements/modelx.dart
+++ b/pkg/compiler/lib/src/elements/modelx.dart
@@ -1012,9 +1012,10 @@ class LibraryElementX
   /** 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;
   }