Download resumption - Preliminary

chrome/browser/download/download_shelf_context_menu.cc

Index: chrome/browser/download/download_shelf_context_menu.cc
diff --git a/chrome/browser/download/download_shelf_context_menu.cc b/chrome/browser/download/download_shelf_context_menu.cc
index 393436aae2d0be84e55908a348499a69853237d2..b7cd0d4c2c41c13ef9f41a8f29f81cdeced13e7d 100644
--- a/chrome/browser/download/download_shelf_context_menu.cc
+++ b/chrome/browser/download/download_shelf_context_menu.cc
@@ -4,12 +4,14 @@
 
 #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 "content/public/browser/download_item.h"
 #include "content/public/browser/download_manager.h"
@@ -46,6 +48,8 @@ ui::SimpleMenuModel* DownloadShelfContextMenu::GetMenuModel() {
 }
 
 bool DownloadShelfContextMenu::IsCommandIdEnabled(int command_id) const {
+  static bool restart_enabled = CommandLine::ForCurrentProcess()->HasSwitch(
+      switches::kEnableDownloadResumption);
   switch (command_id) {
     case SHOW_IN_FOLDER:
       return download_item_->CanShowInFolder() &&
@@ -65,7 +69,7 @@ bool DownloadShelfContextMenu::IsCommandIdEnabled(int command_id) const {
     case CANCEL:
       return download_item_->IsPartialDownload();
     case TOGGLE_PAUSE:
-      return download_item_->IsInProgress();
+      return restart_enabled && download_item_->CanResumeDownload();
     default:
       return command_id > 0 && command_id < MENU_LAST;
   }
@@ -164,8 +168,10 @@ string16 DownloadShelfContextMenu::GetLabelForCommandId(int command_id) const {
     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: