Preliminary work on resuming downloads whose connections have expired.

chrome/browser/views/download_shelf_view.cc

 // Copyright (c) 2010 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/views/download_shelf_view.h"
 
 #include <algorithm>
 
 #include "app/l10n_util.h"
 #include "app/resource_bundle.h"
@@ skipping 122 matching lines @@
   download_views_.push_back(view);
   AddChildView(view);
   if (download_views_.size() > kMaxDownloadViews)
     RemoveDownloadView(*download_views_.begin());
 
   new_item_animation_->Reset();
   new_item_animation_->Show();
 }
 
 void DownloadShelfView::AddDownload(BaseDownloadItemModel* download_model) {
-  DownloadItemView* view = new DownloadItemView(
-      download_model->download(), this, download_model);
+  DownloadItem* dld = download_model->download();
+  // If we already have an ID, we must be restarting an interrupted download.
+  // Don't add a new one in this case.
+  for (size_t i = 0; i < download_views_.size(); ++i) {
+    DownloadItem* download = download_views_[i]->download();
+    if (download->id() == dld->id())
+      return;
+  }
+  DownloadItemView* view = new DownloadItemView(dld, this, download_model);
   AddDownloadView(view);
 }
 
 void DownloadShelfView::MouseMovedOutOfView() {
   Close();
 }
 
 void DownloadShelfView::RemoveDownloadView(View* view) {
   DCHECK(view);
   std::vector<DownloadItemView*>::iterator i =
@@ skipping 219 matching lines @@
   }
 }
 
 bool DownloadShelfView::CanAutoClose() {
   for (size_t i = 0; i < download_views_.size(); ++i) {
     if (!download_views_[i]->download()->opened())
       return false;
   }
   return true;
 }