Introduce flag to disable static popular sites.

components/ntp_tiles/switches.cc

 // Copyright 2016 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 "components/ntp_tiles/switches.h"
 
 namespace ntp_tiles {
 namespace switches {
 
 // Enables using the default search engine country to show country specific
 // popular sites on the NTP.
 const char kEnableNTPSearchEngineCountryDetection[] =
     "enable-ntp-search-engine-country-detection";
 
 // Enables showing popular sites on the NTP.
 const char kEnableNTPPopularSites[]         = "enable-ntp-popular-sites";
 
 // Disables showing popular sites on the NTP.
 const char kDisableNTPPopularSites[]        = "disable-ntp-popular-sites";
 
+// Enables showing baked-in popular sites and their icons on the NTP.
+const char kEnableNTPBakedInSites[] = "enable-ntp-baked-in-sites";
+
+// Disables showing baked-in popular sites and their icons on the NTP.
+const char kDisableNTPBakedInSites[] = "disable-ntp-baked-in-sites";
+
 }  // namespace switches
 }  // namespace ntp_tiles