Three way experiment for "Show saved copy" button.

chrome/renderer/resources/neterror.js

 // Copyright 2013 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.
 
 function toggleHelpBox() {
   var helpBoxOuter = document.getElementById('details');
   helpBoxOuter.classList.toggle('hidden');
   var detailsButton = document.getElementById('details-button');
   if (helpBoxOuter.classList.contains('hidden'))
     detailsButton.innerText = detailsButton.detailsText;
@@ skipping 84 matching lines @@
 // between implementing these in trunk chromium and implementing them in
 // iOS.
 function reloadButtonClick(url) {
   if (window.errorPageController) {
     errorPageController.reloadButtonClick();
   } else {
     location = url;
   }
 }
 
-function loadStaleButtonClick() {
+function showSavedCopyButtonClick() {
   if (window.errorPageController) {
-    errorPageController.loadStaleButtonClick();
+    errorPageController.showSavedCopyButtonClick();
   }
 }
 
 function detailsButtonClick() {
   if (window.errorPageController)
     errorPageController.detailsButtonClick();
 }
 
 var primaryControlOnLeft = true;
 <if expr="is_macosx or is_ios or is_linux or is_android">
 primaryControlOnLeft = false;
 </if>
 
 function onDocumentLoad() {
   var buttonsDiv = document.getElementById('buttons');
   var controlButtonDiv = document.getElementById('control-buttons');
   var reloadButton = document.getElementById('reload-button');
   var detailsButton = document.getElementById('details-button');
-  var staleLoadButton = document.getElementById('stale-load-button');
+  var showSavedCopyButton = document.getElementById('show-saved-copy-button');
 
-  var primaryButton = reloadButton;
-  var secondaryButton = staleLoadButton;
+  var primaryButton, secondaryButton;
+  if (showSavedCopyButton.primary) {
+    primaryButton = showSavedCopyButton;
+    secondaryButton = reloadButton;
+  } else {
+    primaryButton = reloadButton;
+    secondaryButton = showSavedCopyButton;
+  }
 
   // Sets up the proper button layout for the current platform.
   if (primaryControlOnLeft) {
     buttons.classList.add('suggested-left');
-    controlButtonDiv.insertBefore(primaryButton, secondaryButton);
+    controlButtonDiv.insertBefore(secondaryButton, primaryButton);
   } else {
     buttons.classList.add('suggested-right');
-    controlButtonDiv.insertBefore(secondaryButton, primaryButton);
+    controlButtonDiv.insertBefore(primaryButton, secondaryButton);
   }
 
   if (reloadButton.style.display == 'none' &&
-      staleLoadButton.style.display == 'none') {
+      showSavedCopyButton.style.display == 'none') {
     detailsButton.classList.add('singular');
   }
 
 <if expr="not chromeos">
   // Hide the details button if there are no details to show.
   if (loadTimeData.valueExists('summary') &&
           !loadTimeData.getValue('summary').msg) {
     detailsButton.style.display = 'none';
   }
 </if>
 
   // Show control buttons.
   if (loadTimeData.valueExists('reloadButton') &&
           loadTimeData.getValue('reloadButton').msg ||
-      loadTimeData.valueExists('staleLoadButton') &&
-          loadTimeData.getValue('staleLoadButton').msg) {
+      loadTimeData.valueExists('showSavedCopyButton') &&
+          loadTimeData.getValue('showSavedCopyButton').msg) {
     controlButtonDiv.hidden = false;
 
     // Set the secondary button state in the cases of two call to actions.
-    // Reload is secondary to stale load.
-    if (loadTimeData.valueExists('staleLoadButton') &&
-            loadTimeData.getValue('staleLoadButton').msg) {
-      reloadButton.classList.add('secondary-button');
+    if (loadTimeData.valueExists('reloadButton') &&
+            loadTimeData.getValue('reloadButton').msg &&
+        loadTimeData.valueExists('showSavedCopyButton') &&
+            loadTimeData.getValue('showSavedCopyButton').msg) {
+      secondaryButton.classList.add('secondary-button');
     }
   }
 
   // Add a main message paragraph.
   if (loadTimeData.valueExists('primaryParagraph')) {
     var p = document.querySelector('#main-message p');
     p.innerHTML = loadTimeData.getString('primaryParagraph');
     p.hidden = false;
   }
 }
 
 document.addEventListener('DOMContentLoaded', onDocumentLoad);