Add IDBKeyRange to dart:html, port two indexeddb tests

lib/dom/templates/html/interface/interface_IDBKeyRange.darttemplate

Index: lib/dom/templates/html/interface/interface_IDBKeyRange.darttemplate
diff --git a/lib/dom/templates/html/interface/interface_IDBKeyRange.darttemplate b/lib/dom/templates/html/interface/interface_IDBKeyRange.darttemplate
new file mode 100644
index 0000000000000000000000000000000000000000..516a76e05cec77c9304e63c9c99582c1379893ce
--- /dev/null
+++ b/lib/dom/templates/html/interface/interface_IDBKeyRange.darttemplate
@@ -0,0 +1,31 @@
+// 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.
+
+// WARNING: Do not edit - generated code.
+
+$!COMMENT
+interface $ID$EXTENDS default _IDBKeyRangeFactoryProvider {
+
+  /**
+   * @domName IDBKeyRange.only
+   */
+  IDBKeyRange.only(/*IDBKey*/ value);
+
+  /**
+   * @domName IDBKeyRange.lowerBound
+   */
+  IDBKeyRange.lowerBound(/*IDBKey*/ bound, [bool open]);
+
+  /**
+   * @domName IDBKeyRange.upperBound
+   */
+  IDBKeyRange.upperBound(/*IDBKey*/ bound, [bool open]);
+
+  /**
+   * @domName IDBKeyRange.bound
+   */
+  IDBKeyRange.bound(/*IDBKey*/ lower, /*IDBKey*/ upper,
+                    [bool lowerOpen, bool upperOpen]);
+
+$!MEMBERS}