fix sunflower -- dom types were not resolving

lib/src/codegen/js_codegen.dart

Index: lib/src/codegen/js_codegen.dart
diff --git a/lib/src/codegen/js_codegen.dart b/lib/src/codegen/js_codegen.dart
index 3a4194c6676b2869e25715dae14c4db78679f8ac..b111fab4bb00ad352a52d867565940f7ea6dfd8f 100644
--- a/lib/src/codegen/js_codegen.dart
+++ b/lib/src/codegen/js_codegen.dart
@@ -333,12 +333,40 @@ class JSCodegenVisitor extends GeneralizingAstVisitor with ConversionVisitor {
     return _finishClassDef(type, classDecl);
   }
 
+  JS.Statement _emitJsType(ClassDeclaration node, Annotation jsName) {
+    var dartName = node.name.name;
+    String jsTypeName = null;
+
+    if (jsName.arguments != null) {
+      var args = jsName.arguments.arguments;
+      if (args.isNotEmpty && args[0] is NamedExpression) {
+        NamedExpression named = args[0];

[Jacob, 2015/04/13 19:27:14]

seems like we should add a helper method to extract named string parameters from
annotations.

[Jennifer Messerly, 2015/04/13 20:02:10]

Sure thing. Ultimately we need these in analyzer though, or they aren't really
discoverable.

+        if (named.name.label.name == 'name' &&
+            named.expression is StringLiteral) {
+          jsTypeName = (named.expression as StringLiteral).stringValue;
+        }
+      }
+    }
+
+    // We export the JS type as if it was a Dart type. For example this allows
+    // `dom.InputElement` to actually be HTMLInputElement.
+    // TODO(jmesserly): if we had the JS name on the Element, we could 
+    if (isPublic(dartName)) _addExport(dartName);
+
+    if (jsTypeName != null && jsTypeName != dartName) {
+      return js.statement('let # = #;', [dartName, jsTypeName]);
+    }
+    return null;
+  }
+
   @override
   JS.Statement visitClassDeclaration(ClassDeclaration node) {
     // If we've already emitted this class, skip it.
     var type = node.element.type;
     if (_pendingClasses.remove(node.element) == null) return null;
-    if (_getJsNameAnnotation(node) != null) return null;
+
+    var jsName = _getJsNameAnnotation(node);
+    if (jsName != null) return _emitJsType(node, jsName);
 
     currentClass = node;