Handle forwarding constructors of unnamed mixin applications for reflection

pkg/compiler/lib/src/js_backend/mirrors_analysis.dart

Index: pkg/compiler/lib/src/js_backend/mirrors_analysis.dart
diff --git a/pkg/compiler/lib/src/js_backend/mirrors_analysis.dart b/pkg/compiler/lib/src/js_backend/mirrors_analysis.dart
index 93344f61e0353eba1364fc81ed37c81cf4d412b1..c66c8f1d0a116168e3c28f7cadfb4e2ff6645834 100644
--- a/pkg/compiler/lib/src/js_backend/mirrors_analysis.dart
+++ b/pkg/compiler/lib/src/js_backend/mirrors_analysis.dart
@@ -4,6 +4,7 @@
 
 library dart2js.mirrors_handler;
 
+import '../common.dart';
 import '../common/resolution.dart';
 import '../diagnostics/diagnostic_listener.dart';
 import '../elements/elements.dart';
@@ -189,8 +190,13 @@ class MirrorsHandler {
     lib.forEachLocalMember((Element member) {
       if (member.isInjected) return;
       if (member.isClass) {
-        _enqueueReflectiveElementsInClass(member, recents,
-            enclosingWasIncluded: includeLibrary);
+        ClassElement cls = member;
+        cls.ensureResolved(_resolution);
+        do {
+          _enqueueReflectiveElementsInClass(cls, recents,
+              enclosingWasIncluded: includeLibrary);
+          cls = cls.superclass;
+        } while (cls != null && cls.isUnnamedMixinApplication);
       } else {
         _enqueueReflectiveMember(member, includeLibrary);
       }