[ios] Dispatcher for tab_strip and tab_grid.

ios/showcase/tab_grid/sc_tab_grid_coordinator.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.
 
 #import "ios/showcase/tab_grid/sc_tab_grid_coordinator.h"
 
 #import "base/format_macros.h"
-#import "ios/clean/chrome/browser/ui/commands/tab_commands.h"
+#import "ios/clean/chrome/browser/ui/commands/tab_grid_commands.h"
 #import "ios/clean/chrome/browser/ui/tab_collection/tab_collection_data_source.h"
 #import "ios/clean/chrome/browser/ui/tab_grid/tab_grid_view_controller.h"
 #import "ios/showcase/common/protocol_alerter.h"
 
 #if !defined(__has_feature) || !__has_feature(objc_arc)
 #error "This file requires ARC support."
 #endif
 
 @interface SCTabGridCoordinator ()<TabCollectionDataSource>
 @property(nonatomic, strong) TabGridViewController* viewController;
 @property(nonatomic, strong) ProtocolAlerter* alerter;
 @end
 
 @implementation SCTabGridCoordinator
 @synthesize baseViewController = _baseViewController;
 @synthesize viewController = _viewController;
 @synthesize alerter = _alerter;
 
 - (void)start {
-  self.alerter =
-      [[ProtocolAlerter alloc] initWithProtocols:@[ @protocol(TabCommands) ]];
+  self.alerter = [[ProtocolAlerter alloc] initWithProtocols:@[
+    @protocol(SettingsCommands), @protocol(TabGridCommands)
+  ]];
   self.alerter.baseViewController = self.baseViewController;
 
   self.viewController = [[TabGridViewController alloc] init];
   self.viewController.title = @"Tab Grid";
   self.viewController.dataSource = self;
-  self.viewController.tabCommandHandler =
-      static_cast<id<TabCommands>>(self.alerter);
+  self.viewController.dispatcher =
+      static_cast<id<SettingsCommands, TabGridCommands>>(self.alerter);
 
   [self.baseViewController setHidesBarsOnSwipe:YES];
   [self.baseViewController pushViewController:self.viewController animated:YES];
 }
 
 #pragma mark - TabCollectionDataSource
 
 - (int)numberOfTabs {
   return 3;
 }
 
 - (NSString*)titleAtIndex:(int)index {
   return [NSString stringWithFormat:@"Tab %d", index];
 }
 
 - (int)indexOfActiveTab {
   return kTabCollectionDataSourceInvalidIndex;
 }
 
 @end