[ios] Dispatcher for tab_strip and tab_grid.

ios/clean/chrome/browser/ui/tab_strip/tab_strip_view_controller.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/clean/chrome/browser/ui/tab_strip/tab_strip_view_controller.h"
 
+#import "ios/clean/chrome/browser/ui/commands/tab_strip_commands.h"
+
 #if !defined(__has_feature) || !__has_feature(objc_arc)
 #error "This file requires ARC support."
 #endif
 
 namespace {
 CGFloat kItemLength = 100.0f;
 CGFloat kSpacing = 10.0f;
 }
 
 @implementation TabStripViewController
+@synthesize dispatcher = _dispatcher;
 
 - (UICollectionViewLayout*)collectionViewLayout {
   UICollectionViewFlowLayout* layout =
       [[UICollectionViewFlowLayout alloc] init];
   layout.itemSize = CGSizeMake(kItemLength, kItemLength);
   layout.minimumInteritemSpacing = kSpacing;
   layout.sectionInset =
       UIEdgeInsetsMake(kSpacing, kSpacing, kSpacing, kSpacing);
   layout.scrollDirection = UICollectionViewScrollDirectionHorizontal;
   return layout;
 }
 
+- (void)showTabAtIndex:(int)index {
+  [self.dispatcher showTabStripTabAtIndex:index];
+}
+
+- (void)closeTabAtIndex:(int)index {
+  [self.dispatcher closeTabStripTabAtIndex:index];
+}
+
 @end