Add flags for CrOS Component using Feature API

chrome/browser/flag_descriptions.cc

 // Copyright 2017 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/flag_descriptions.h"
 
 namespace flag_descriptions {
 
 //  Material Design version of chrome://bookmarks
 
@@ skipping 2314 matching lines @@
 
 const char kEnableTouchSupportForScreenMagnifierDescription[] =
     "Enables touch support for screen magnifier";
 
 const char kEnableZipArchiverOnFileManagerName[] =
     "ZIP archiver for Drive";
 
 const char kEnableZipArchiverOnFileManagerDescription[] =
     "Enable the ability to archive and unpack files on Drive in the Files app";
 
+const char kCrOSComponentName[] = "Chrome OS Component";
+
+const char kCrOSComponentDescription[] =
+    "Enable the use of Chrome OS Component to download Chrome OS features "
+    "on-demand as components.";
+
 #endif  // defined(OS_CHROMEOS)
 
 #if defined(OS_ANDROID)
 
 const char kContentSuggestionsCategoryOrderName[] =
     "Default content suggestions category order (e.g. on NTP)";
 
 const char kContentSuggestionsCategoryOrderDescription[] =
     "Set default order of content suggestion categories (e.g. on the NTP).";
 
@@ skipping 739 matching lines @@
 
 const char kEnableHeapProfilingDescription[] = "Enables heap profiling.";
 
 const char kEnableHeapProfilingModePseudo[] = "Enabled (pseudo mode)";
 
 const char kEnableHeapProfilingModeNative[] = "Enabled (native mode)";
 
 const char kEnableHeapProfilingTaskProfiler[] = "Enabled (task mode)";
 
 }  // namespace flag_descriptions