UI changes associated with downloads resumption.

chrome/browser/download/download_shelf_context_menu.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/download/download_shelf_context_menu.h"
 
+#include "base/command_line.h"
 #include "chrome/browser/browser_process.h"
 #include "chrome/browser/download/download_crx_util.h"
 #include "chrome/browser/download/download_item_model.h"
 #include "chrome/browser/download/download_prefs.h"
 #include "chrome/browser/safe_browsing/download_protection_service.h"
 #include "chrome/browser/safe_browsing/safe_browsing_service.h"
+#include "chrome/common/chrome_switches.h"
 #include "chrome/common/extensions/extension.h"
 #include "chrome/common/url_constants.h"
 #include "content/public/browser/download_item.h"
 #include "content/public/browser/download_manager.h"
 #include "content/public/browser/page_navigator.h"
 #include "grit/generated_resources.h"
 #include "ui/base/l10n/l10n_util.h"
 
 using content::DownloadItem;
 using extensions::Extension;
@@ skipping 19 matching lines @@
   else if (download_item_->IsComplete())
     model = GetFinishedMenuModel();
   else if (download_item_->IsInterrupted())
     model = GetInterruptedMenuModel();
   else
     model = GetInProgressMenuModel();
   return model;
 }
 
 bool DownloadShelfContextMenu::IsCommandIdEnabled(int command_id) const {
+  static bool restart_enabled = CommandLine::ForCurrentProcess()->HasSwitch(
+      switches::kEnableDownloadResumption);
   switch (static_cast<ContextMenuCommands>(command_id)) {
     case SHOW_IN_FOLDER:
       return download_item_->CanShowInFolder();
     case OPEN_WHEN_COMPLETE:
       return download_item_->CanOpenDownload() &&
           !download_crx_util::IsExtensionDownload(*download_item_);
     case ALWAYS_OPEN_TYPE:
       // For temporary downloads, the target filename might be a temporary
       // filename. Don't base an "Always open" decision based on it. Also
       // exclude extensions.
       return download_item_->CanOpenDownload() &&
           !download_crx_util::IsExtensionDownload(*download_item_);
     case CANCEL:
       return download_item_->IsPartialDownload();
     case TOGGLE_PAUSE:
-      return download_item_->IsInProgress();
+      return restart_enabled && download_item_->CanResumeDownload();
     case DISCARD:
     case KEEP:
     case LEARN_MORE_SCANNING:
     case LEARN_MORE_INTERRUPTED:
       return true;
   }
   return false;
 }
 
 bool DownloadShelfContextMenu::IsCommandIdChecked(int command_id) const {
@@ skipping 88 matching lines @@
       return l10n_util::GetStringUTF16(IDS_DOWNLOAD_MENU_SHOW);
     case OPEN_WHEN_COMPLETE:
       if (download_item_->IsInProgress())
         return l10n_util::GetStringUTF16(IDS_DOWNLOAD_MENU_OPEN_WHEN_COMPLETE);
       return l10n_util::GetStringUTF16(IDS_DOWNLOAD_MENU_OPEN);
     case ALWAYS_OPEN_TYPE:
       return l10n_util::GetStringUTF16(IDS_DOWNLOAD_MENU_ALWAYS_OPEN_TYPE);
     case CANCEL:
       return l10n_util::GetStringUTF16(IDS_DOWNLOAD_MENU_CANCEL);
     case TOGGLE_PAUSE: {
-      if (download_item_->IsPaused())
+      if (download_item_->IsPaused() ||
+          download_item_->CanResumeInterrupted()) {
         return l10n_util::GetStringUTF16(IDS_DOWNLOAD_MENU_RESUME_ITEM);
+      }
       return l10n_util::GetStringUTF16(IDS_DOWNLOAD_MENU_PAUSE_ITEM);
     }
     case DISCARD:
       return l10n_util::GetStringUTF16(IDS_DOWNLOAD_MENU_DISCARD);
     case KEEP:
       return l10n_util::GetStringUTF16(IDS_DOWNLOAD_MENU_KEEP);
     case LEARN_MORE_SCANNING:
       return l10n_util::GetStringUTF16(IDS_DOWNLOAD_MENU_LEARN_MORE_SCANNING);
     case LEARN_MORE_INTERRUPTED:
       return l10n_util::GetStringUTF16(
@@ skipping 73 matching lines @@
   malicious_download_menu_model_->AddItemWithStringId(
       DISCARD, IDS_DOWNLOAD_MENU_DISCARD);
   malicious_download_menu_model_->AddItemWithStringId(
       KEEP, IDS_DOWNLOAD_MENU_KEEP);
   malicious_download_menu_model_->AddSeparator(ui::NORMAL_SEPARATOR);
   malicious_download_menu_model_->AddItemWithStringId(
       LEARN_MORE_SCANNING, IDS_DOWNLOAD_MENU_LEARN_MORE_SCANNING);
 
   return malicious_download_menu_model_.get();
 }