[ios] RootCoordinator and view controller.

ios/clean/chrome/browser/ui/toolbar/toolbar_view_controller.h

 // 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.
 
 #ifndef IOS_CLEAN_CHROME_BROWSER_UI_TOOLBAR_TOOLBAR_VIEW_CONTROLLER_H_
 #define IOS_CLEAN_CHROME_BROWSER_UI_TOOLBAR_TOOLBAR_VIEW_CONTROLLER_H_
 
 #import <UIKit/UIKit.h>
 
 #import "ios/clean/chrome/browser/ui/animators/zoom_transition_delegate.h"
 #import "ios/clean/chrome/browser/ui/toolbar/toolbar_consumer.h"
 
+@protocol TabGridCommands;
 @protocol ToolsMenuCommands;
 @protocol NavigationCommands;
 
 // View controller for a toolbar, which will show a horizontal row of
 // controls and/or labels.
 // This view controller will fill its container; it is up to the containing
 // view controller or presentation controller to configure an appropriate
 // height for it.
 @interface ToolbarViewController
     : UIViewController<ZoomTransitionDelegate, ToolbarConsumer>
 
 // The dispatcher for this view controller
-@property(nonatomic, weak) id<ToolsMenuCommands, NavigationCommands> dispatcher;
+@property(nonatomic, weak)
+    id<TabGridCommands, ToolsMenuCommands, NavigationCommands>
+        dispatcher;
 
 @property(nonatomic, strong) UIViewController* locationBarViewController;
 
 @end
 
 #endif  // IOS_CLEAN_CHROME_BROWSER_UI_TOOLBAR_TOOLBAR_VIEW_CONTROLLER_H_