Show the 'unsupported flag' message for --{enable,disable}-blink-features.

chrome/browser/ui/startup/bad_flags_prompt.cc

 // 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.
 
 #include "chrome/browser/ui/startup/bad_flags_prompt.h"
 
 #include "base/command_line.h"
 #include "base/files/file_path.h"
 #include "base/strings/utf_string_conversions.h"
 #include "chrome/browser/infobars/infobar_service.h"
@@ skipping 56 matching lines @@
     translate::switches::kTranslateScriptURL,
 
     // This flag gives extensions more powers.
     extensions::switches::kExtensionsOnChromeURLs,
 
 #if defined(OS_LINUX) && !defined(OS_CHROMEOS)
     // Speech dispatcher is buggy, it can crash and it can make Chrome freeze.
     // http://crbug.com/327295
     switches::kEnableSpeechDispatcher,
 #endif
+
+    // These flags control Blink feature state, which is not supported and is
+    // intended only for use by Chromium developers.
+    switches::kDisableBlinkFeatures,
+    switches::kEnableBlinkFeatures,
+
     NULL
   };
 
   for (const char** flag = kBadFlags; *flag; ++flag) {
     if (base::CommandLine::ForCurrentProcess()->HasSwitch(*flag)) {
       SimpleAlertInfoBarDelegate::Create(
           InfoBarService::FromWebContents(web_contents),
           infobars::InfoBarDelegate::kNoIconID,
           l10n_util::GetStringFUTF16(IDS_BAD_FLAGS_WARNING_MESSAGE,
                                      base::UTF8ToUTF16(
@@ skipping 30 matching lines @@
                                  user_data_dir.LossyDisplayName());
 
   if (cleanup_resource_bundle)
     ResourceBundle::CleanupSharedInstance();
 
   // More complex dialogs cannot be shown before the earliest calls here.
   ShowMessageBox(NULL, title, message, chrome::MESSAGE_BOX_TYPE_WARNING);
 }
 
 }  // namespace chrome