Conversions between JavaScript objects and Maps.

Review URL: https://chromiumcodereview.appspot.com//10870030

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@11208 260f80e4-7a28-3924-810f-c04153c831b5

lib/html/dart2js/html_dart2js.dart

@@ -38573,15 +38573,23 @@ _convertDartToNative_ImageData(ImageData imageData) {
 
 
 /// Converts a JavaScript object with properties into a Dart Map.
+/// Not suitable for nested objects.
 Map _convertNativeToDart_Dictionary(object) {
   // TODO: Implement.
-  return object;
+  var dict = {};
+  for (final key in JS('List', 'Object.getOwnPropertyNames(#)', object)) {
+    dict[key] = JS('var', '#[#]', object, key);
+  }
+  return dict;
 }
 
-/// Converts a Dart map into a JavaScript object with properties.
+/// Converts a flat Dart map into a JavaScript object with properties.
 _convertDartToNative_Dictionary(Map dict) {
-  // TODO: Implement.
-  return dict;
+  var object = JS('var', '{}');
+  dict.forEach((String key, value) {
+      JS('void', '#[#] = #', object, key, value);
+    });
+  return object;
 }
 
 

lib/html/src/dart2js_Conversions.dart

@@ -84,15 +84,23 @@ _convertDartToNative_ImageData(ImageData imageData) {
 
 
 /// Converts a JavaScript object with properties into a Dart Map.
+/// Not suitable for nested objects.
 Map _convertNativeToDart_Dictionary(object) {
   // TODO: Implement.
-  return object;
+  var dict = {};
+  for (final key in JS('List', 'Object.getOwnPropertyNames(#)', object)) {
+    dict[key] = JS('var', '#[#]', object, key);
+  }
+  return dict;
 }
 
-/// Converts a Dart map into a JavaScript object with properties.
+/// Converts a flat Dart map into a JavaScript object with properties.
 _convertDartToNative_Dictionary(Map dict) {
-  // TODO: Implement.
-  return dict;
+  var object = JS('var', '{}');
+  dict.forEach((String key, value) {
+      JS('void', '#[#] = #', object, key, value);
+    });
+  return object;
 }