Web shell test to go back and forward.

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

+// 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/navigation_egutil.h"
+
+#import <EarlGrey/EarlGrey.h>
+
+#import "ios/web/shell/view_controller.h"
+#include "ios/web/web_state/web_state_impl.h"
+
+using web::NavigationManager;
+
+// TODO(crbug.com/604902): Refactor these utilities into objects that can be
+// shared accross the web shell and Chrome.
+namespace navigation_egutil {

[baxley, 2016/04/21 16:09:18]

I'm working on a better design for the utilities, so I have it like this just to
get things rolling.

+
+void LoadURL(GURL url) {
+  ViewController* viewController = (ViewController*)[
+      [[[UIApplication sharedApplication] delegate] window] rootViewController];
+
+  DCHECK(viewController);
+  NavigationManager* navigationManager =
+      [viewController webState]->GetNavigationManager();
+  DCHECK(navigationManager);
+  NavigationManager::WebLoadParams params(url);
+  params.transition_type = ui::PAGE_TRANSITION_TYPED;
+  navigationManager->LoadURLWithParams(params);
+}
+
+}  // namespace earl_grey_util