Add "Cast..." menu item to macOS menu bar

chrome/browser/ui/cocoa/browser_window_command_handler.mm

 // Copyright 2015 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/ui/cocoa/browser_window_command_handler.h"
 
 #include "base/logging.h"
 #import "base/mac/foundation_util.h"
 #include "chrome/app/chrome_command_ids.h"
 #import "chrome/browser/app_controller_mac.h"
+#include "chrome/browser/media/router/media_router_feature.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/ui/bookmarks/bookmark_utils.h"
 #include "chrome/browser/ui/browser_commands.h"
 #include "chrome/browser/ui/browser_finder.h"
 #include "chrome/browser/ui/browser_window.h"
 #import "chrome/browser/ui/cocoa/browser_window_controller_private.h"
 #include "chrome/common/pref_names.h"
 #include "chrome/grit/generated_resources.h"
 #include "content/public/browser/user_metrics.h"
 #include "content/public/browser/web_contents.h"
@@ skipping 134 matching lines @@
       [menuItem setHidden:shouldHide];
       break;
     }
     case IDC_SHOW_AS_TAB: {
       // Hide this menu option if the window is tabbed or is the devtools
       // window.
       NSMenuItem* menuItem = base::mac::ObjCCast<NSMenuItem>(item);
       [menuItem setHidden:browser->is_type_tabbed() || browser->is_devtools()];
       break;
     }
+    case IDC_ROUTE_MEDIA: {
+      // Hide this menu option if Media Router is disabled.
+      NSMenuItem* menuItem = base::mac::ObjCCast<NSMenuItem>(item);
+      [menuItem
+          setHidden:!media_router::MediaRouterEnabled(browser->profile())];
+      break;
+    }
     default:
       break;
   }
 
   // If the item is toggleable, find its toggle state and
   // try to update it.  This is a little awkward, but the alternative is
   // to check after a commandDispatch, which seems worse.
   UpdateToggleStateWithTag(tag, item, window);
 
   return enable;
@@ skipping 28 matching lines @@
     // the background" in this case.
     modifierFlags &= ~NSCommandKeyMask;
   }
   chrome::ExecuteCommandWithDisposition(
       FindBrowserForSender(sender, window), command,
       ui::WindowOpenDispositionFromNSEventWithFlags([NSApp currentEvent],
                                                     modifierFlags));
 }
 
 @end