MD History: Lazily load element files which are not needed for first paint

chrome/browser/ui/webui/md_history_ui.cc

Index: chrome/browser/ui/webui/md_history_ui.cc
diff --git a/chrome/browser/ui/webui/md_history_ui.cc b/chrome/browser/ui/webui/md_history_ui.cc
index e6b721ffdae91558b0721d33ad76571d11d3f725..28693fe75e2af1faa04b64e1dcbb19396774c66b 100644
--- a/chrome/browser/ui/webui/md_history_ui.cc
+++ b/chrome/browser/ui/webui/md_history_ui.cc
@@ -141,6 +141,10 @@ content::WebUIDataSource* CreateMdHistoryUIHTMLSource(Profile* profile) {
                           IDR_MD_HISTORY_APP_VULCANIZED_HTML);
   source->AddResourcePath("app.crisper.js",
                           IDR_MD_HISTORY_APP_CRISPER_JS);
+  source->AddResourcePath("lazy_load.html",
+                          IDR_MD_HISTORY_LAZY_LOAD_VULCANIZED_HTML);
+  source->AddResourcePath("lazy_load.crisper.js",
+                          IDR_MD_HISTORY_LAZY_LOAD_CRISPER_JS);
 #else
   source->AddResourcePath("app.html", IDR_MD_HISTORY_APP_HTML);
   source->AddResourcePath("app.js", IDR_MD_HISTORY_APP_JS);
@@ -166,6 +170,7 @@ content::WebUIDataSource* CreateMdHistoryUIHTMLSource(Profile* profile) {
   source->AddResourcePath("history_toolbar.js",
                           IDR_MD_HISTORY_HISTORY_TOOLBAR_JS);
   source->AddResourcePath("icons.html", IDR_MD_HISTORY_ICONS_HTML);
+  source->AddResourcePath("lazy_load.html", IDR_MD_HISTORY_LAZY_LOAD_HTML);
   source->AddResourcePath("list_container.html",
                           IDR_MD_HISTORY_LIST_CONTAINER_HTML);
   source->AddResourcePath("list_container.js",