MD History: Only load needed paper-icon-buttons instead of whole set of icons

chrome/browser/ui/webui/md_history_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/md_history_ui.h"
 
 #include "build/build_config.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/ui/webui/browsing_history_handler.h"
 #include "chrome/browser/ui/webui/foreign_session_handler.h"
@@ skipping 44 matching lines @@
   source->AddLocalizedString("searchResults", IDS_HISTORY_SEARCH_RESULTS);
   source->AddLocalizedString("title", IDS_HISTORY_TITLE);
 
   bool allow_deleting_history =
       prefs->GetBoolean(prefs::kAllowDeletingBrowserHistory);
   source->AddBoolean("allowDeletingHistory", allow_deleting_history);
   source->AddResourcePath("app.html", IDR_MD_HISTORY_APP_HTML);
   source->AddResourcePath("app.js", IDR_MD_HISTORY_APP_JS);
   source->AddResourcePath("constants.html", IDR_MD_HISTORY_CONSTANTS_HTML);
   source->AddResourcePath("constants.js", IDR_MD_HISTORY_CONSTANTS_JS);
+  source->AddResourcePath("history_icons.html",
+                          IDR_MD_HISTORY_HISTORY_ICONS_HTML);
   source->AddResourcePath("history_item.html",
                           IDR_MD_HISTORY_HISTORY_ITEM_HTML);
   source->AddResourcePath("history_item.js", IDR_MD_HISTORY_HISTORY_ITEM_JS);
   source->AddResourcePath("history_list.html",
                           IDR_MD_HISTORY_HISTORY_LIST_HTML);
   source->AddResourcePath("history_list.js", IDR_MD_HISTORY_HISTORY_LIST_JS);
   source->AddResourcePath("history_toolbar.html",
                           IDR_MD_HISTORY_HISTORY_TOOLBAR_HTML);
   source->AddResourcePath("history_toolbar.js",
                           IDR_MD_HISTORY_HISTORY_TOOLBAR_JS);
@@ skipping 32 matching lines @@
   content::WebUIDataSource::Add(profile, CreateMdHistoryUIHTMLSource(profile));
 }
 
 MdHistoryUI::~MdHistoryUI() {}
 
 base::RefCountedMemory* MdHistoryUI::GetFaviconResourceBytes(
     ui::ScaleFactor scale_factor) {
   return ResourceBundle::GetSharedInstance().LoadDataResourceBytesForScale(
       IDR_HISTORY_FAVICON, scale_factor);
 }