Fixing Indexed DB's CursorWithValue.value

tests/html/indexeddb_4_test.dart

 library IndexedDB4Test;
 import '../../pkg/unittest/lib/unittest.dart';
 import '../../pkg/unittest/lib/html_config.dart';
 import 'dart:async';
 import 'dart:html' as html;
 import 'dart:indexed_db';
 import 'utils.dart';
 
 // Test for KeyRange and Cursor.
 
 const String DB_NAME = 'Test';
 const String STORE_NAME = 'TEST';
 const int VERSION = 1;
 
 Future<Database> createAndOpenDb() {
   return html.window.indexedDB.deleteDatabase(DB_NAME).then((_) {
     return html.window.indexedDB.open(DB_NAME, version: VERSION,
         onUpgradeNeeded: (e) {
           var db = e.target.result;
           db.createObjectStore(STORE_NAME);
         });
   });
 }
 
 Future<Database> writeItems(Database db) {
   Future<Object> write(index) {
     var transaction = db.transaction([STORE_NAME], 'readwrite');
-    return transaction.objectStore(STORE_NAME).put('Item $index', index);
+    return transaction.objectStore(STORE_NAME).put(
+        {'content': 'Item $index'}, index);
   }
 
   var future = write(0);
   for (var i = 1; i < 100; ++i) {
     future = future.then((_) => write(i));
   }
 
   // Chain on the DB so we return it at the end.
   return future.then((_) => db);
 }
 
 Future<Database> setupDb() {
   return createAndOpenDb().then(writeItems);
 }
 
 testRange(db, range, expectedFirst, expectedLast) {
   Transaction txn = db.transaction(STORE_NAME, 'readonly');
   ObjectStore objectStore = txn.objectStore(STORE_NAME);
   var cursors = objectStore.openCursor(range: range, autoAdvance: true)
       .asBroadcastStream();
 
   int lastKey;
   cursors.listen((cursor) {
     lastKey = cursor.key;
+    var value = cursor.value;
+    expect(value['content'], 'Item ${cursor.key}');
   });
 
   if (expectedFirst != null) {
     cursors.first.then((cursor) {
       expect(cursor.key, expectedFirst);
     });
   }
   if (expectedLast != null) {
     cursors.last.then((cursor) {
       expect(lastKey, expectedLast);
@@ skipping 58 matching lines @@
 
     bound4() =>
         // OPTIONALS testRange(db, new KeyRange.bound(20, 30, lowerOpen: true),
         testRange(db, new KeyRange.bound(20, 30, true), 21, 30);
 
     bound5() =>
         // OPTIONALS testRange(db, new KeyRange.bound(20, 30, lowerOpen: true, upperOpen: true),
         testRange(db, new KeyRange.bound(20, 30, true, true), 21, 29);
   }
 }