preload polymer elements in options page

chrome/browser/ui/webui/options/browser_options_handler.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/options/browser_options_handler.h"
 
 #include <stddef.h>
 
 #include <set>
 #include <utility>
@@ skipping 177 matching lines @@
       return "signOutAndSignIn";
     case sync_ui_util::UPGRADE_CLIENT:
       return "upgradeClient";
     case sync_ui_util::ENTER_PASSPHRASE:
       return "enterPassphrase";
     default:
       return "noAction";
   }
 }
 
+#if defined(OS_CHROMEOS)
+bool g_enable_polymer_preload = true;
+#endif  // defined(OS_CHROMEOS)
 }  // namespace
 
 namespace options {
 
 BrowserOptionsHandler::BrowserOptionsHandler()
     : page_initialized_(false),
       template_url_service_(NULL),
       cloud_print_mdns_ui_enabled_(false),
 #if defined(OS_CHROMEOS)
       enable_factory_reset_(false),
@@ skipping 507 matching lines @@
       IDS_OPTIONS_SETTINGS_ACCESSIBILITY_SCREEN_MAGNIFIER_FULL));
   magnifier_list->Append(std::move(option_full));
 
   std::unique_ptr<base::ListValue> option_partial(new base::ListValue);
   option_partial->AppendInteger(ash::MAGNIFIER_PARTIAL);
   option_partial->AppendString(l10n_util::GetStringUTF16(
       IDS_OPTIONS_SETTINGS_ACCESSIBILITY_SCREEN_MAGNIFIER_PARTIAL));
   magnifier_list->Append(std::move(option_partial));
 
   values->Set("magnifierList", magnifier_list.release());
-#endif
+  values->SetBoolean("enablePolymerPreload", g_enable_polymer_preload);
+#endif  // defined(OS_CHROMEOS)
 
 #if defined(OS_MACOSX)
   values->SetString("macPasswordsWarning",
       l10n_util::GetStringUTF16(IDS_OPTIONS_PASSWORDS_MAC_WARNING));
   values->SetBoolean("multiple_profiles",
       g_browser_process->profile_manager()->GetNumberOfProfiles() > 1);
 #endif
 
   if (ShouldShowMultiProfilesUserList())
     values->Set("profilesInfo", GetProfilesInfoList().release());
@@ skipping 1608 matching lines @@
 
 void BrowserOptionsHandler::OnPolicyUpdated(const policy::PolicyNamespace& ns,
                                             const policy::PolicyMap& previous,
                                             const policy::PolicyMap& current) {
   std::set<std::string> different_keys;
   current.GetDifferingKeys(previous, &different_keys);
   if (base::ContainsKey(different_keys, policy::key::kMetricsReportingEnabled))
     SetupMetricsReportingCheckbox();
 }
 
+#if defined(OS_CHROMEOS)
+// static
+void BrowserOptionsHandler::DisablePolymerPreloadForTesting() {
+  g_enable_polymer_preload = false;
+}
+#endif  // defined(OS_CHROMEOS)
+
 bool BrowserOptionsHandler::IsDeviceOwnerProfile() {
 #if defined(OS_CHROMEOS)
   return chromeos::ProfileHelper::IsOwnerProfile(Profile::FromWebUI(web_ui()));
 #else
   return true;
 #endif
 }
 
 }  // namespace options