Emit declarations for typedefs that are needed by reflection.

sdk/lib/_internal/lib/js_mirrors.dart

Index: sdk/lib/_internal/lib/js_mirrors.dart
diff --git a/sdk/lib/_internal/lib/js_mirrors.dart b/sdk/lib/_internal/lib/js_mirrors.dart
index 912af14a257dfcc692e14c9b283ab7f93312b26d..c322846f94b1e3723cebeee027417d7aed3e5a8e 100644
--- a/sdk/lib/_internal/lib/js_mirrors.dart
+++ b/sdk/lib/_internal/lib/js_mirrors.dart
@@ -4,7 +4,7 @@
 
 library dart._js_mirrors;
 
-import 'dart:async';
+import '../compiler/implementation/runtime_data.dart' as encoding;
 
 import 'dart:collection' show
     UnmodifiableListView,
@@ -334,10 +334,12 @@ class JsLibraryMirror extends JsDeclarationMirror with JsObjectMirror
       var cls = reflectClassByMangledName(className);
       if (cls is ClassMirror) {
         cls = cls.originalDeclaration;
-        if (cls is JsClassMirror) {
-          result[cls.simpleName] = cls;
-          cls._owner = this;
-        }
+      }
+      if (cls is JsClassMirror) {
+        result[cls.simpleName] = cls;
+        cls._owner = this;
+      } else  if (cls is JsTypedefMirror) {
+        result[cls.simpleName] = cls;
       }
     }
     return _cachedClasses =
@@ -572,12 +574,6 @@ TypeMirror reflectClassByName(Symbol symbol, String mangledName) {
   }
   var constructor = JS('var', 'init.allClasses[#]', mangledName);
   if (constructor == null) {
-    int index = JS('int|Null', 'init.functionAliases[#]', mangledName);
-    if (index != null) {
-      mirror = new JsTypedefMirror(symbol, mangledName, getMetadata(index));
-      JsCache.update(classMirrors, mangledName, mirror);
-      return mirror;
-    }
     // Probably an intercepted class.
     // TODO(ahe): How to handle intercepted classes?
     throw new UnsupportedError('Cannot find class for: ${n(symbol)}');
@@ -602,23 +598,28 @@ TypeMirror reflectClassByName(Symbol symbol, String mangledName) {
     }
   }
 
-  var superclassName = fields.split(';')[0];
-  var mixins = superclassName.split('+');
-  if (mixins.length > 1 && mangledGlobalNames[mangledName] == null) {
-    mirror = reflectMixinApplication(mixins, mangledName);
+  if (encoding.isTypedefDescriptor(fields)) {
+    int index = encoding.getTypeFromTypedef(fields);
+    mirror = new JsTypedefMirror(symbol, mangledName, getMetadata(index));
   } else {
-    ClassMirror classMirror = new JsClassMirror(
-        symbol, mangledName, constructor, fields, fieldsMetadata);
-    List typeVariables =
-        JS('JSExtendableArray|Null', '#.prototype["<>"]', constructor);
-    if (typeVariables == null || typeVariables.length == 0) {
-      mirror = classMirror;
+    var superclassName = fields.split(';')[0];
+    var mixins = superclassName.split('+');
+    if (mixins.length > 1 && mangledGlobalNames[mangledName] == null) {
+      mirror = reflectMixinApplication(mixins, mangledName);
     } else {
-      String typeArguments = 'dynamic';
-      for (int i = 1; i < typeVariables.length; i++) {
-        typeArguments += ',dynamic';
+      ClassMirror classMirror = new JsClassMirror(
+          symbol, mangledName, constructor, fields, fieldsMetadata);
+      List typeVariables =
+          JS('JSExtendableArray|Null', '#.prototype["<>"]', constructor);
+      if (typeVariables == null || typeVariables.length == 0) {
+        mirror = classMirror;
+      } else {
+        String typeArguments = 'dynamic';
+        for (int i = 1; i < typeVariables.length; i++) {
+          typeArguments += ',dynamic';
+        }
+        mirror = new JsTypeBoundClassMirror(classMirror, typeArguments);
       }
-      mirror = new JsTypeBoundClassMirror(classMirror, typeArguments);
     }
   }