MD Settings: Add "Show Google Now cards in the launcher" row in Search section.

chrome/browser/extensions/api/settings_private/prefs_util.cc

 // Copyright 2015 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/extensions/api/settings_private/prefs_util.h"
 
 #include "build/build_config.h"
 #include "chrome/browser/browser_process.h"
 #include "chrome/browser/extensions/chrome_extension_function.h"
 #include "chrome/browser/extensions/settings_api_helpers.h"
@@ skipping 147 matching lines @@
   (*s_whitelist)[spellcheck::prefs::kSpellCheckUseSpellingService] =
       settings_private::PrefType::PREF_TYPE_BOOLEAN;
   (*s_whitelist)[::prefs::kEnableTranslate] =
       settings_private::PrefType::PREF_TYPE_BOOLEAN;
   (*s_whitelist)[translate::TranslatePrefs::kPrefTranslateBlockedLanguages] =
       settings_private::PrefType::PREF_TYPE_LIST;
 
   // Search page.
   (*s_whitelist)[::prefs::kDefaultSearchProviderEnabled] =
       settings_private::PrefType::PREF_TYPE_BOOLEAN;
+  (*s_whitelist)[::prefs::kGoogleNowLauncherEnabled] =
+      settings_private::PrefType::PREF_TYPE_BOOLEAN;
 
   // Site Settings prefs.
   (*s_whitelist)[::prefs::kBlockThirdPartyCookies] =
       settings_private::PrefType::PREF_TYPE_BOOLEAN;
   (*s_whitelist)[::prefs::kPluginsAlwaysOpenPdfExternally] =
       settings_private::PrefType::PREF_TYPE_BOOLEAN;
 
   // Clear browsing data settings.
   (*s_whitelist)[browsing_data::prefs::kDeleteBrowsingHistory] =
       settings_private::PrefType::PREF_TYPE_BOOLEAN;
@@ skipping 547 matching lines @@
   if (pref_object.key == ::prefs::kDefaultSearchProviderEnabled)
     return GetExtensionOverridingSearchEngine(profile_);
 
   if (pref_object.key == proxy_config::prefs::kProxy)
     return GetExtensionOverridingProxy(profile_);
 
   return nullptr;
 }
 
 }  // namespace extensions