Web shell test to go back and forward.

ios/web/shell/test/utils/eg_util.mm

Index: ios/web/shell/test/utils/eg_util.mm
diff --git a/ios/web/shell/test/utils/eg_util.mm b/ios/web/shell/test/utils/eg_util.mm
new file mode 100644
index 0000000000000000000000000000000000000000..22525b6e94731f020575c8f65f53f2b91f5d1a85
--- /dev/null
+++ b/ios/web/shell/test/utils/eg_util.mm
@@ -0,0 +1,19 @@
+// 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.
+
+#include "ios/web/shell/test/utils/eg_util.h"
+
+#import "ios/web/shell/view_controller.h"
+
+namespace earl_grey_util {
+
+CRWWebController* GetCurrentWebController() {
+  ViewController* vc = (ViewController*)[

[Eugene But (OOO till 7-30), 2016/04/16 00:38:40]

From Style Guide:

Readers should be able to infer the variable type from the name, but do not use
Hungarian notation for syntactic attributes, such as the static type of a
variable (int or pointer). Give as descriptive a name as possible, within
reason.

Please use more descriptive name than vc.

[baxley, 2016/04/21 16:09:17]

Done.

+      [[[UIApplication sharedApplication] delegate] window] rootViewController];
+  DCHECK(vc);
+  CRWWebController* wc = [vc webController];

[Eugene But (OOO till 7-30), 2016/04/16 00:38:40]

NIT: Drop this variable

[baxley, 2016/04/21 16:09:17]

Acknowledged.

+  return wc;
+}
+
+}  // namespace earl_grey_util