In-app messaging to communicate the imminent 32-bit deprecation to 32-bit-only users

chrome/browser/ui/webui/help/version_updater_mac.mm

 // 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/help/version_updater_mac.h"
 
 #include "base/bind.h"
 #include "base/bind_helpers.h"
 #include "chrome/browser/lifetime/application_lifetime.h"
 #import "chrome/browser/mac/keystone_glue.h"
+#include "chrome/browser/mac/obsolete_system.h"
 #include "grit/chromium_strings.h"
 #include "grit/generated_resources.h"
 #include "ui/base/l10n/l10n_util.h"
 
 // KeystoneObserver is a simple notification observer for Keystone status
 // updates. It will be created and managed by VersionUpdaterMac.
 @interface KeystoneObserver : NSObject {
  @private
   VersionUpdaterMac* versionUpdater_;  // Weak.
 }
@@ skipping 195 matching lines @@
   if (!promote_callback_.is_null()) {
     PromotionState promotion_state = PROMOTE_HIDDEN;
     if (show_promote_button_)
       promotion_state = enable_promote_button ? PROMOTE_ENABLED
                                               : PROMOTE_DISABLED;
     promote_callback_.Run(promotion_state);
   }
 }
 
 void VersionUpdaterMac::UpdateShowPromoteButton() {
+  if (ObsoleteSystemMac::Has32BitOnlyCPU() &&
+      ObsoleteSystemMac::Is32BitEndOfTheLine()) {
+    // Promotion is moot upon reaching the end of the line.
+    show_promote_button_ = false;
+    return;
+  }
+
   KeystoneGlue* keystone_glue = [KeystoneGlue defaultKeystoneGlue];
   AutoupdateStatus recent_status = [keystone_glue recentStatus];
   if (recent_status == kAutoupdateRegistering ||
       recent_status == kAutoupdateRegisterFailed ||
       recent_status == kAutoupdatePromoted) {
     // Promotion isn't possible at this point.
     show_promote_button_ = false;
   } else if (recent_status == kAutoupdatePromoting ||
              recent_status == kAutoupdatePromoteFailed) {
     // Show promotion UI because the user either just clicked that button or
     // because the user should be able to click it again.
     show_promote_button_ = true;
   } else {
     // Show the promote button if promotion is a possibility.
     show_promote_button_ = [keystone_glue wantsPromotion];
   }
 }