Typecheck some of ui/webui/resources/js/ with Closure compiler.

third_party/closure_compiler/externs/pending_compiler_externs.js

Index: third_party/closure_compiler/externs/pending_compiler_externs.js
diff --git a/third_party/closure_compiler/externs/pending_compiler_externs.js b/third_party/closure_compiler/externs/pending_compiler_externs.js
new file mode 100644
index 0000000000000000000000000000000000000000..9945b2e99ae5273efe7268f83ff55da28088843b
--- /dev/null
+++ b/third_party/closure_compiler/externs/pending_compiler_externs.js
@@ -0,0 +1,15 @@
+// Copyright 2014 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+/**
+ * @fileoverview Temporary externs until compiler/compiler.jar catches up.
+ * @externs
+ */
+
+/**
+ * @see http://dom.spec.whatwg.org/#dom-domimplementation-createhtmldocument
+ * @param {string=} opt_title The title to give the new HTML document.
+ * @return {!HTMLDocument}
+ */
+DOMImplementation.prototype.createHTMLDocument = function(opt_title) {};