[Mac] Support for Touch Bar Customization

chrome/browser/app_controller_mac.mm

 // Copyright (c) 2012 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 "chrome/browser/app_controller_mac.h"
 
 #include <stddef.h>
 
 #include "base/auto_reset.h"
 #include "base/bind.h"
@@ skipping 723 matching lines @@
   if (localState) {
     localPrefRegistrar_.Init(localState);
     localPrefRegistrar_.Add(
         prefs::kAllowFileSelectionDialogs,
         base::Bind(&chrome::BrowserCommandController::UpdateOpenFileState,
                    menuState_.get()));
   }
 
   handoff_active_url_observer_bridge_.reset(
       new HandoffActiveURLObserverBridge(self));
+
+  NSApplication* application = [NSApplication sharedApplication];
+  if ([application respondsToSelector:
+      @selector(setAutomaticCustomizeTouchBarMenuItemEnabled:)]) {
+    [application setAutomaticCustomizeTouchBarMenuItemEnabled:YES];
+  }
 }
 
 // Helper function for populating and displaying the in progress downloads at
 // exit alert panel.
 - (BOOL)userWillWaitForInProgressDownloads:(int)downloadCount {
   NSString* titleText = nil;
   NSString* explanationText = nil;
   NSString* waitTitle = nil;
   NSString* exitTitle = nil;
 
@@ skipping 848 matching lines @@
 
 //---------------------------------------------------------------------------
 
 namespace app_controller_mac {
 
 bool IsOpeningNewWindow() {
   return g_is_opening_new_window;
 }
 
 }  // namespace app_controller_mac