Adds --file-manager-new-ui to chrome://flags.

chrome/browser/about_flags.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/about_flags.h"
 
 #include <string.h>
 
 #include <algorithm>
 #include <iterator>
@@ skipping 1020 matching lines @@
     SINGLE_VALUE_TYPE(ash::switches::kAshDisableNewLockAnimations),
   },
   {
     "file-manager-legacy",
     IDS_FLAGS_FILE_MANAGER_LEGACY_NAME,
     IDS_FLAGS_FILE_MANAGER_LEGACY_DESCRIPTION,
     kOsCrOS,
     SINGLE_VALUE_TYPE(switches::kFileManagerLegacy),
   },
   {
+    "file-manager-new-ui",
+    IDS_FLAGS_FILE_MANAGER_NEW_UI_NAME,
+    IDS_FLAGS_FILE_MANAGER_NEW_UI_DESCRIPTION,
+    kOsCrOS,
+    SINGLE_VALUE_TYPE(switches::kFileManagerNewUI),
+  },
+  {
     "disable-launcher-per-display",
     IDS_FLAGS_DISABLE_LAUNCHER_PER_DISPLAY_NAME,
     IDS_FLAGS_DISABLE_LAUNCHER_PER_DISPLAY_DESCRIPTION,
     kOsCrOS,
     SINGLE_VALUE_TYPE(ash::switches::kAshDisableLauncherPerDisplay),
   },
   {
     "disable-app-mode",
     IDS_FLAGS_DISABLE_KIOSK_APPS_NAME,
     IDS_FLAGS_DISABLE_KIOSK_APPS_DESCRIPTION,
@@ skipping 791 matching lines @@
 }
 
 const Experiment* GetExperiments(size_t* count) {
   *count = num_experiments;
   return experiments;
 }
 
 }  // namespace testing
 
 }  // namespace about_flags