[Content suggestions] Add a feature to fetch favicons from a new server

chrome/browser/flag_descriptions.h

 // 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.
 
 #ifndef CHROME_BROWSER_FLAG_DESCRIPTIONS_H_
 #define CHROME_BROWSER_FLAG_DESCRIPTIONS_H_
 
 // Includes needed for macros allowing conditional compilation of some strings.
 #include "build/build_config.h"
 #include "build/buildflag.h"
@@ skipping 2463 matching lines @@
 extern const char kContentSuggestionsCategoryRankerDescription[];
 
 // Name for the flag to enable increased visibilty for snippets on the New Tab
 // Page.
 extern const char kEnableNtpSnippetsVisibilityName[];
 
 // Description for the flag to enable increased visibility for recently viewed
 // tabs on the New Tab page.
 extern const char kEnableNtpSnippetsVisibilityDescription[];
 
+// Name for the flag to enable new favicon server for content suggestions on the
+// New Tab Page.
+extern const char kEnableContentSuggestionsNewFaviconServerName[];
+
+// Description for the flag to enable new favicon server for content suggestions
+// on the New Tab Page.
+extern const char kEnableContentSuggestionsNewFaviconServerDescription[];
+
 // Name for the flag to enable server-side suggestions on the New Tab Page.
 extern const char kEnableNtpRemoteSuggestionsName[];
 
 // Description for the flag to enable server-side suggestions on the New Tab
 // Page.
 extern const char kEnableNtpRemoteSuggestionsDescription[];
 
 // Name for the flag to enable suggestions for recently viewed tabs, which were
 // captured offline, on the New Tab page.
 extern const char kEnableNtpRecentOfflineTabSuggestionsName[];
@@ skipping 653 matching lines @@
 
 // Description of the about: flag enabling emoji, handwriting and voice input on
 // opt-in IME menu.
 extern const char kEnableEhvInputDescription[];
 
 #endif  // #if defined(OS_CHROMEOS)
 
 }  // namespace flag_descriptions
 
 #endif  // CHROME_BROWSER_FLAG_DESCRIPTIONS_H_