Add feature to control showing suggestion summaries.

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 2365 matching lines @@
     "If enabled, missing favicons for NTP tiles get downloaded from Google. "
     "This only applies to tiles that originate from synced history.";
 
 const char kEnableContentSuggestionsSettingsName[] =
     "Show content suggestions settings.";
 
 const char kEnableContentSuggestionsSettingsDescription[] =
     "If enabled, the content suggestions settings will be available from the "
     "main settings menu.";
 
+const char kEnableContentSuggestionsShowSummaryName[] =
+    "Show content suggestions summaries.";
+
+const char kEnableContentSuggestionsShowSummaryDescription[] =
+    "If enabled, the content suggestions summaries will be shown.";
+
 const char kEnableNtpRemoteSuggestionsName[] =
     "Show server-side suggestions on the New Tab page";
 
 const char kEnableNtpRemoteSuggestionsDescription[] =
     "If enabled, the list of content suggestions on the New Tab page (see "
     "#enable-ntp-snippets) will contain server-side suggestions (e.g., "
     "Articles for you). Furthermore, it allows to override the source used "
     "to retrieve these server-side suggestions.";
 
 const char kEnableNtpRecentOfflineTabSuggestionsName[] =
@@ skipping 735 matching lines @@
     "hard-reload.";
 
 const char kCaptureThumbnailOnLoadFinishedName[] =
     "Capture page thumbnail on load finished";
 
 const char kCaptureThumbnailOnLoadFinishedDescription[] =
     "Capture a page thumbnail (for use on the New Tab page) when the page load "
     "finishes, in addition to other times a thumbnail may be captured.";
 
 }  // namespace flag_descriptions