[ios] RootCoordinator and view controller.

ios/showcase/toolbar/sc_toolbar_coordinator.mm

Index: ios/showcase/toolbar/sc_toolbar_coordinator.mm
diff --git a/ios/showcase/toolbar/sc_toolbar_coordinator.mm b/ios/showcase/toolbar/sc_toolbar_coordinator.mm
index 312aeab45f72d127907dc8b0aa8ebf3be8c666a2..db59fb915a2cbffa7ad689c071fdaa8ef2968e60 100644
--- a/ios/showcase/toolbar/sc_toolbar_coordinator.mm
+++ b/ios/showcase/toolbar/sc_toolbar_coordinator.mm
@@ -5,6 +5,7 @@
 #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/tools_menu_commands.h"
 #import "ios/clean/chrome/browser/ui/toolbar/toolbar_view_controller.h"
 #import "ios/showcase/common/protocol_alerter.h"
@@ -44,7 +45,8 @@ CGFloat kToolbarHeight = 50.0f;
   ToolbarViewController* toolbarViewController =
       [[ToolbarViewController alloc] init];
   toolbarViewController.dispatcher =
-      static_cast<id<ToolsMenuCommands, NavigationCommands>>(self.alerter);
+      static_cast<id<TabGridCommands, ToolsMenuCommands, NavigationCommands>>(
+          self.alerter);
   [containerViewController addChildViewController:toolbarViewController];
   toolbarViewController.view.frame = containerView.frame;
   [containerView addSubview:toolbarViewController.view];