Add TypeVariable object on runtime to support reflection on type variables.

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 2887c43e96c54ee929b4c4cdeee517e96f7c0d8f..9461d92a85b88eb54b4bc56b69ec85b7607339e8 100644
--- a/sdk/lib/_internal/lib/js_mirrors.dart
+++ b/sdk/lib/_internal/lib/js_mirrors.dart
@@ -27,7 +27,8 @@ import 'dart:_js_helper' show
     getMangledTypeName,
     throwInvalidReflectionError,
     hasReflectableProperty,
-    runtimeTypeToString;
+    runtimeTypeToString,
+    TypeVariable;
 import 'dart:_interceptors' show
     Interceptor,
     JSExtendableArray;
@@ -1320,12 +1321,13 @@ class JsClassMirror extends JsTypeMirror with JsObjectMirror
    List typeVars =
         JS('JSExtendableArray|Null', '#.prototype["<>"]', _jsConstructor);
     if (typeVars == null) return result;
-    for (int i = 0; i < typeVars.length; i += 2) {
+    for (int i = 0; i < typeVars.length; i++) {
+      TypeVariable typeVar = JS('', 'init.metadata[#]', typeVars[i]);
+      var bound = JS('', 'init.metadata[#]', typeVar.bound);
       TypeMirror upperBound =
-         typeMirrorFromRuntimeTypeRepresentation(JS('', 'init.metadata[#]',
-                                                    typeVars[i+1]));
-      var typeMirror =
-          new JsTypeVariableMirror(s(typeVars[i]), upperBound, this);
+          typeMirrorFromRuntimeTypeRepresentation(bound);
+      TypeVariableMirror typeMirror =
+          new JsTypeVariableMirror(s(typeVar.name), upperBound, this);

[ahe, 2013/10/14 13:07:07]

Why isn't this simply:

TypeVariable typeVar = JS('', 'init.metadata[#]', typeVars[i]);
result.add(new JsTypeVariableMirror(typeVar, this))

[zarah, 2013/10/15 14:20:02]

Done.

       result.add(typeMirror);
     }
     return _cachedTypeVariables = new UnmodifiableListView(result);