Add NativeEnqueuer to work with the Enqueuer.

sdk/lib/_internal/compiler/implementation/resolution/members.dart

Index: sdk/lib/_internal/compiler/implementation/resolution/members.dart
diff --git a/sdk/lib/_internal/compiler/implementation/resolution/members.dart b/sdk/lib/_internal/compiler/implementation/resolution/members.dart
index f4d43e517453376079a78eee7f87381546285da6..126d7c4b21501ef4faed55644153febe44c3bc2b 100644
--- a/sdk/lib/_internal/compiler/implementation/resolution/members.dart
+++ b/sdk/lib/_internal/compiler/implementation/resolution/members.dart
@@ -1735,6 +1735,10 @@ class ResolverVisitor extends CommonResolverVisitor<Element> {
       } else if (!selector.applies(target, compiler)) {
         warnArgumentMismatch(node, target);
       }
+
+      if (selector.name == const SourceString('JS')) {
+        world.nativeEnqueuer.registerJsCall(node, this);
+      }
     }
 
     // TODO(ngeoffray): Warn if target is null and the send is
@@ -1751,6 +1755,15 @@ class ResolverVisitor extends CommonResolverVisitor<Element> {
             [target.name]);
   }
 
+  /// Callback for native enqueuer to parse a type.  Returns [:null:] on error.
+  DartType resolveTypeFromString(String typeName) {
+    Element element = scope.lookup(new SourceString(typeName));
+    if (element == null) return null;
+    if (element is! ClassElement) return null;
+    element.ensureResolved(compiler);
+    return element.computeType(compiler);
+  }
+
   visitSendSet(SendSet node) {
     Element target = resolveSend(node);
     Element setter = target;