[Resumption 9/11] Handle filename determination for resumed downloads.

chrome/browser/chromeos/drive/download_handler.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/chromeos/drive/download_handler.h"
 
 #include "base/bind.h"
 #include "base/file_util.h"
 #include "base/supports_user_data.h"
 #include "chrome/browser/chromeos/drive/drive.pb.h"
@@ skipping 227 matching lines @@
   switch (download->GetState()) {
     case DownloadItem::IN_PROGRESS:
       break;
 
     case DownloadItem::COMPLETE:
       UploadDownloadItem(download);
       data->set_complete();
       break;
 
     case DownloadItem::CANCELLED:
+      download->SetUserData(&kDrivePathKey, NULL);
+      break;
+
     case DownloadItem::INTERRUPTED:
-      download->SetUserData(&kDrivePathKey, NULL);
+      // Interrupted downloads can be resumed. Keep the Drive user data around
+      // so that it can be used when the download resumes. The download is truly
+      // done when it's complete, is cancelled or is removed.
       break;
 
     default:
       NOTREACHED();
   }
 }
 
 void DownloadHandler::OnEntryFound(
     const base::FilePath& drive_dir_path,
     const SubstituteDriveDownloadPathCallback& callback,
@@ skipping 36 matching lines @@
 }
 
 void DownloadHandler::UploadDownloadItem(DownloadItem* download) {
   DCHECK(download->IsComplete());
   file_write_helper_->PrepareWritableFileAndRun(
       util::ExtractDrivePath(GetTargetPath(download)),
       base::Bind(&MoveDownloadedFile, download->GetTargetFilePath()));
 }
 
 }  // namespace drive