MD Settings: Separate code to be loaded lazily to its own lazy_load.html

chrome/browser/ui/webui/settings/md_settings_ui.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/ui/webui/settings/md_settings_ui.h"
 
 #include <stddef.h>
 
 #include <string>
 
@@ skipping 187 matching lines @@
   AddSettingsPageUIHandler(
       base::WrapUnique(AboutHandler::Create(html_source, profile)));
   AddSettingsPageUIHandler(
       base::WrapUnique(ResetSettingsHandler::Create(html_source, profile)));
 
   // Add the metrics handler to write uma stats.
   web_ui->AddMessageHandler(base::MakeUnique<MetricsHandler>());
 
 #if BUILDFLAG(USE_VULCANIZE)
   html_source->AddResourcePath("crisper.js", IDR_MD_SETTINGS_CRISPER_JS);
+  html_source->AddResourcePath("lazy_load.crisper.js",
+                               IDR_MD_SETTINGS_LAZY_LOAD_CRISPER_JS);
+  html_source->AddResourcePath("lazy_load.html",
+                               IDR_MD_SETTINGS_LAZY_LOAD_VULCANIZED_HTML);
   html_source->SetDefaultResource(IDR_MD_SETTINGS_VULCANIZED_HTML);
   html_source->UseGzip(std::unordered_set<std::string>());
 #else
   // Add all settings resources.
   for (size_t i = 0; i < kSettingsResourcesSize; ++i) {
     html_source->AddResourcePath(kSettingsResources[i].name,
                                  kSettingsResources[i].value);
   }
   html_source->SetDefaultResource(IDR_SETTINGS_SETTINGS_HTML);
 #endif
@@ skipping 27 matching lines @@
   UMA_HISTOGRAM_TIMES("Settings.LoadDocumentTime.MD",
                       base::Time::Now() - load_start_time_);
 }
 
 void MdSettingsUI::DocumentOnLoadCompletedInMainFrame() {
   UMA_HISTOGRAM_TIMES("Settings.LoadCompletedTime.MD",
                       base::Time::Now() - load_start_time_);
 }
 
 }  // namespace settings