Introduce StickyKeys settings item with behind flag.

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 <algorithm>
 #include <iterator>
 #include <map>
 #include <set>
@@ skipping 1568 matching lines @@
         switches::kHighDPISupport,"0")
   },
 #if defined(OS_CHROMEOS)
   {
     "enable-quickoffice-editing",
     IDS_FLAGS_ENABLE_QUICKOFFICE_DESKTOP_EDIT_NAME,
     IDS_FLAGS_ENABLE_QUICKOFFICE_DESKTOP_EDIT_DESCRIPTION,
     kOsCrOS,
     SINGLE_VALUE_TYPE(switches::kEnableQuickofficeEdit),
   },
+  {
+    "enable-sticky-keys",
+    IDS_FLAGS_ENABLE_STICKY_KEYS_NAME,
+    IDS_FLAGS_ENABLE_STICKY_KEYS_DESCRIPTION,
+    kOsCrOS,
+    SINGLE_VALUE_TYPE(switches::kEnableStickyKeys),
+  },
 #endif
   {
     "enable-translate-settings",
     IDS_FLAGS_ENABLE_TRANSLATE_SETTINGS_NAME,
     IDS_FLAGS_ENABLE_TRANSLATE_SETTINGS_DESCRIPTION,
     kOsAll,
     SINGLE_VALUE_TYPE(switches::kEnableTranslateSettings)
   },
   {
     "enable-web-midi",
@@ skipping 516 matching lines @@
 }
 
 const Experiment* GetExperiments(size_t* count) {
   *count = num_experiments;
   return experiments;
 }
 
 }  // namespace testing
 
 }  // namespace about_flags