views: Add support for absolute positioned overlay views.

To test:
Run `cefclient.exe --use-views --hide-frame --hide-controls`
Add `--enable-chrome-runtime` for the same behavior using the Chrome location
bar instead of a text field.

libcef/common/i18n_util_impl.cc

@@ -0,0 +1,11 @@
+// Copyright 2021 The Chromium Embedded Framework Authors. All rights
+// reserved. Use of this source code is governed by a BSD-style license that can
+// be found in the LICENSE file.
+
+#include "include/cef_i18n_util.h"
+
+#include "base/i18n/rtl.h"
+
+bool CefIsRTL() {
+  return base::i18n::IsRTL();
+}