Web shell test to go back and forward.

ios/web/shell/test/web_shell_test_util.mm

Index: ios/web/shell/test/web_shell_test_util.mm
diff --git a/ios/web/shell/test/web_shell_test_util.mm b/ios/web/shell/test/web_shell_test_util.mm
new file mode 100644
index 0000000000000000000000000000000000000000..4cacb4f022e6d8042e40ac8f14682d326ff73b99
--- /dev/null
+++ b/ios/web/shell/test/web_shell_test_util.mm
@@ -0,0 +1,18 @@
+// Copyright 2016 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.
+
+#import "ios/web/shell/test/web_shell_test_util.h"
+
+#include <UIKit/UIKit.h>
+
+namespace web {
+namespace web_shell_test_util {
+
+ViewController* GetCurrentViewController() {
+  return (ViewController*)[[[[UIApplication sharedApplication] delegate] window]
+      rootViewController];
+}
+
+}  // namespace web_shell_test_util
+}  // namespace web