add @MirrorsUsed to observe/polymer/polymer_exprs pkgs

pkg/polymer/lib/src/reflected_type.dart

Index: pkg/polymer/lib/src/reflected_type.dart
diff --git a/pkg/polymer/lib/src/reflected_type.dart b/pkg/polymer/lib/src/reflected_type.dart
new file mode 100644
index 0000000000000000000000000000000000000000..ad11ffb61f0af33c504f97c7431c71d3470e6c1a
--- /dev/null
+++ b/pkg/polymer/lib/src/reflected_type.dart
@@ -0,0 +1,31 @@
+// Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+
+library polymer.src.reflected_type;
+
+// These are used by _getReflectedTypeWorkaround, see http://dartbug.com/12607
+@MirrorsUsed(targets:
+    const ['_js_helper.createRuntimeType', 'dart._js_mirrors.JsClassMirror'],
+    override: 'polymer.src.reflected_type')

[Siggi Cherem (dart-lang), 2013/10/15 21:52:18]

ditto

[Jennifer Messerly, 2013/10/15 22:03:29]

ditto :)

+import 'dart:mirrors';
+
+// Horrible hack to work around: http://dartbug.com/12607
+Type getReflectedTypeWorkaround(ClassMirror cls) {
+  // On Dart VM, just return reflectedType.
+  if (1.0 is! int) return cls.reflectedType;
+
+  var mangledName = reflect(cls).getField(_mangledNameField).reflectee;
+  Type type = _jsHelper.invoke(#createRuntimeType, [mangledName]).reflectee;
+  return type;
+}
+
+final LibraryMirror _jsHelper =
+    currentMirrorSystem().libraries[Uri.parse('dart:_js_helper')];
+
+final Symbol _mangledNameField = () {
+  var jsClassMirrorMirror = reflect(reflectClass(ClassMirror)).type;
+  for (var name in jsClassMirrorMirror.variables.keys) {
+    if (MirrorSystem.getName(name) == '_mangledName') return name;
+  }
+}();