Added tests to previously broken functionality and added null checks.

sdk/lib/indexed_db/dart2js/indexed_db_dart2js.dart

Index: sdk/lib/indexed_db/dart2js/indexed_db_dart2js.dart
diff --git a/sdk/lib/indexed_db/dart2js/indexed_db_dart2js.dart b/sdk/lib/indexed_db/dart2js/indexed_db_dart2js.dart
index 80671f8cf067acb2a893015a36fee3d550bbb7e4..1f18147a44da2d26bd9fa147b9bf69e71c5e356d 100644
--- a/sdk/lib/indexed_db/dart2js/indexed_db_dart2js.dart
+++ b/sdk/lib/indexed_db/dart2js/indexed_db_dart2js.dart
@@ -900,19 +900,19 @@ class ObjectStore native "IDBObjectStore" {
   @DomName('IDBObjectStore.createIndex')
   @DocsEditable
   Index $dom_createIndex(String name, keyPath, [Map options]) {
-    if ((keyPath is List<String> || keyPath == null) && !?options) {
+    if (keyPath is List<String> && keyPath != null && !?options) {
       List keyPath_1 = convertDartToNative_StringArray(keyPath);
       return _$dom_createIndex_1(name, keyPath_1);
     }
-    if ((keyPath is List<String> || keyPath == null)) {
+    if (keyPath is List<String> && keyPath != null) {

[blois, 2013/05/13 21:09:16]

keyPath is List<String> && keyPath != null is overly redundant.

       List keyPath_2 = convertDartToNative_StringArray(keyPath);
       var options_3 = convertDartToNative_Dictionary(options);
       return _$dom_createIndex_2(name, keyPath_2, options_3);
     }
-    if ((keyPath is String || keyPath == null) && !?options) {
+    if (keyPath is String && keyPath != null && !?options) {
       return _$dom_createIndex_3(name, keyPath);
     }
-    if ((keyPath is String || keyPath == null)) {
+    if (keyPath is String && keyPath != null) {
       var options_4 = convertDartToNative_Dictionary(options);
       return _$dom_createIndex_4(name, keyPath, options_4);
     }