[ios clean] Toolbar accessibility and showcase egtests

ios/showcase/toolbar/sc_toolbar_coordinator.mm

 // Copyright 2017 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/showcase/toolbar/sc_toolbar_coordinator.h"
 
 #import "ios/clean/chrome/browser/ui/commands/navigation_commands.h"
 #import "ios/clean/chrome/browser/ui/commands/tab_grid_commands.h"
 #import "ios/clean/chrome/browser/ui/commands/tab_strip_commands.h"
 #import "ios/clean/chrome/browser/ui/commands/tools_menu_commands.h"
@@ skipping 26 matching lines @@
 
   UIViewController* containerViewController = [[UIViewController alloc] init];
   containerViewController.view.backgroundColor = [UIColor whiteColor];
   containerViewController.title = @"Toolbar";
 
   UIView* containerView = [[UIView alloc] init];
   [containerViewController.view addSubview:containerView];
   containerView.backgroundColor = [UIColor redColor];
   containerView.translatesAutoresizingMaskIntoConstraints = NO;
 
-  ToolbarViewController* toolbarViewController =
-      [[ToolbarViewController alloc] init];
-  toolbarViewController.dispatcher =
+  id dispatcher =
       static_cast<id<NavigationCommands, TabGridCommands, TabStripCommands,
                      ToolsMenuCommands>>(self.alerter);
+  ToolbarViewController* toolbarViewController =
+      [[ToolbarViewController alloc] initWithDispatcher:dispatcher];
   [containerViewController addChildViewController:toolbarViewController];
   toolbarViewController.view.frame = containerView.frame;
   [containerView addSubview:toolbarViewController.view];
   [toolbarViewController didMoveToParentViewController:containerViewController];
 
   [NSLayoutConstraint activateConstraints:@[
     [containerView.heightAnchor constraintEqualToConstant:kToolbarHeight],
     [containerView.leadingAnchor
         constraintEqualToAnchor:containerViewController.view.leadingAnchor],
     [containerView.trailingAnchor
         constraintEqualToAnchor:containerViewController.view.trailingAnchor],
     [containerView.centerYAnchor
         constraintEqualToAnchor:containerViewController.view.centerYAnchor],
   ]];
 
   [self.baseViewController pushViewController:containerViewController
                                      animated:YES];
 }
 
 @end