Preliminary work on resuming downloads whose connections have expired.

chrome/browser/views/download_shelf_view.cc

Index: chrome/browser/views/download_shelf_view.cc
diff --git a/chrome/browser/views/download_shelf_view.cc b/chrome/browser/views/download_shelf_view.cc
index 3f9a825cc48285e11167b98b2dc21a14c07c837b..f4e9655c5dba275fff999d2c79dcd2b855ee7511 100644
--- a/chrome/browser/views/download_shelf_view.cc
+++ b/chrome/browser/views/download_shelf_view.cc
@@ -140,8 +140,15 @@ void DownloadShelfView::AddDownloadView(DownloadItemView* view) {
 }
 
 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);
 }