Make html lists print a nice toString method.

sdk/lib/web_sql/dart2js/web_sql_dart2js.dart

 /**
  * An API for storing data in the browser that can be queried with SQL.
  *
  * **Caution:** this specification is no longer actively maintained by the Web
  * Applications Working Group and may be removed at any time.
  * See [the W3C Web SQL Database specification](http://www.w3.org/TR/webdatabase/)
  * for more information.
  *
  * The [dart:indexed_db] APIs is a recommended alternatives.
  */
@@ skipping 420 matching lines @@
     if (end == null) end = length;
     return Lists.getRange(this, start, end, <Map>[]);
   }
 
   List<Map> getRange(int start, int rangeLength) =>
       sublist(start, start + rangeLength);
 
   Map<int, Map> asMap() =>
     IterableMixinWorkaround.asMapList(this);
 
+  String toString() {
+    StringBuffer buffer = new StringBuffer('[');
+    buffer.writeAll(this, ', ');
+    buffer.write(']');
+    return buffer.toString();
+  }
+
   // -- end List<Map> mixins.
 
   @DomName('SQLResultSetRowList.item')
   @DocsEditable
   @Creates('=Object')
   Map item(int index) {
     return convertNativeToDart_Dictionary(_item_1(index));
   }
   @JSName('item')
   @DomName('SQLResultSetRowList.item')
@@ skipping 26 matching lines @@
 @DomName('SQLTransactionSync')
 @SupportedBrowser(SupportedBrowser.CHROME)
 @SupportedBrowser(SupportedBrowser.SAFARI)
 @Experimental
 class SqlTransactionSync native "*SQLTransactionSync" {
 
   @DomName('SQLTransactionSync.executeSql')
   @DocsEditable
   SqlResultSet executeSql(String sqlStatement, List arguments) native;
 }