Add IDBKeyRange to dart:html, port two indexeddb tests

lib/html/src/dartium_FactoryProviders.dart

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 class _AudioContextFactoryProvider {
   factory AudioContext() => _wrap(new dom.AudioContext());
 }
 
+class _IDBKeyRangeFactoryProvider {
+
+  factory IDBKeyRange.only(/*IDBKey*/ value) =>
+      _wrap(new dom.IDBKeyRange.only(_unwrap(value)));
+
+  factory IDBKeyRange.lowerBound(/*IDBKey*/ bound, [bool open = false]) =>
+      _wrap(new dom.IDBKeyRange.lowerBound(_unwrap(bound), open));
+
+  factory IDBKeyRange.upperBound(/*IDBKey*/ bound, [bool open = false]) =>
+      _wrap(new dom.IDBKeyRange.upperBound(_unwrap(bound), open));
+
+  factory IDBKeyRange.bound(/*IDBKey*/ lower, /*IDBKey*/ upper,
+                            [bool lowerOpen = false, bool upperOpen = false]) =>
+      _wrap(new dom.IDBKeyRange.bound(_unwrap(lower), _unwrap(upper),
+                                      lowerOpen, upperOpen));
+}
+
 class _TypedArrayFactoryProvider {
 
   factory Float32Array(int length) => _F32(length);
   factory Float32Array.fromList(List<num> list) => _F32_1(ensureNative(list));
   factory Float32Array.fromBuffer(ArrayBuffer buffer,
                                   [int byteOffset = 0, int length]) {
     if (length == null) return _F32_2(buffer, byteOffset);
     return _F32_3(buffer, byteOffset, length);
   }
 
@@ skipping 110 matching lines @@
 }
 
 class _WebSocketFactoryProvider {
 
   factory WebSocket(String url) => _wrap(new dom.WebSocket(url));
 }
 
 class _TextFactoryProvider {
   factory Text(String data) => _document.$dom_createTextNode(data);
 }