Refresh the Incognito NTP layout on default font size change

chrome/browser/ui/webui/ntp/new_tab_ui.cc

 // Copyright (c) 2012 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/ui/webui/ntp/new_tab_ui.h"
 
 #include <memory>
 #include <string>
 
 #include "base/i18n/rtl.h"
 #include "base/memory/ptr_util.h"
 #include "base/memory/ref_counted_memory.h"
 #include "base/strings/utf_string_conversions.h"
 #include "base/values.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/ui/webui/ntp/app_launcher_handler.h"
 #include "chrome/browser/ui/webui/ntp/core_app_launcher_handler.h"
 #include "chrome/browser/ui/webui/ntp/ntp_resource_cache.h"
 #include "chrome/browser/ui/webui/ntp/ntp_resource_cache_factory.h"
 #include "chrome/browser/ui/webui/theme_handler.h"
+#include "chrome/common/pref_names.h"
 #include "chrome/common/url_constants.h"
 #include "components/bookmarks/common/bookmark_pref_names.h"
 #include "components/prefs/pref_service.h"
 #include "components/strings/grit/components_strings.h"
 #include "content/public/browser/browser_thread.h"
 #include "content/public/browser/render_process_host.h"
 #include "content/public/browser/web_contents.h"
 #include "content/public/browser/web_ui.h"
 #include "ui/base/l10n/l10n_util.h"
 #include "url/gurl.h"
@@ skipping 26 matching lines @@
     web_ui->AddMessageHandler(base::MakeUnique<ThemeHandler>());
 
   // content::URLDataSource assumes the ownership of the html source.
   content::URLDataSource::Add(
       profile, new NewTabHTMLSource(profile->GetOriginalProfile()));
 
   pref_change_registrar_.Init(profile->GetPrefs());
   pref_change_registrar_.Add(bookmarks::prefs::kShowBookmarkBar,
                              base::Bind(&NewTabUI::OnShowBookmarkBarChanged,
                                         base::Unretained(this)));
+  pref_change_registrar_.Add(
+      prefs::kWebKitDefaultFontSize,
+      base::Bind(&NewTabUI::OnDefaultFontSizeChanged, base::Unretained(this)));
 }
 
 NewTabUI::~NewTabUI() {}
 
 void NewTabUI::OnShowBookmarkBarChanged() {
   base::Value attached(
       GetProfile()->GetPrefs()->GetBoolean(bookmarks::prefs::kShowBookmarkBar)
           ? "true"
           : "false");
   web_ui()->CallJavascriptFunctionUnsafe("ntp.setBookmarkBarAttached",
                                          attached);
 }
 
+void NewTabUI::OnDefaultFontSizeChanged() {
+  web_ui()->CallJavascriptFunctionUnsafe("ntp.defaultFontSizeChanged");
+}
+
 // static
 void NewTabUI::RegisterProfilePrefs(
     user_prefs::PrefRegistrySyncable* registry) {
   CoreAppLauncherHandler::RegisterProfilePrefs(registry);
   AppLauncherHandler::RegisterProfilePrefs(registry);
 }
 
 // static
 bool NewTabUI::IsNewTab(const GURL& url) {
   return url.GetOrigin() == GURL(chrome::kChromeUINewTabURL).GetOrigin();
@@ skipping 107 matching lines @@
   return "img-src chrome-search://thumb chrome-search://thumb2 "
       "chrome-search://theme chrome://theme data:;";
 }
 
 std::string NewTabUI::NewTabHTMLSource::GetContentSecurityPolicyChildSrc()
     const {
   return "child-src chrome-search://most-visited;";
 }
 
 NewTabUI::NewTabHTMLSource::~NewTabHTMLSource() {}