[Downloads] Add more browsertests for resumption.

content/public/test/test_file_error_injector.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 "content/public/test/test_file_error_injector.h"
 
 #include <vector>
 
 #include "base/compiler_specific.h"
 #include "base/logging.h"
@@ skipping 105 matching lines @@
     const TestFileErrorInjector::FileErrorInfo& error_info,
     const ConstructionCallback& ctor_callback,
     const DestructionCallback& dtor_callback)
         : DownloadFileImpl(
             save_info.Pass(), default_download_directory, url, referrer_url,
             calculate_hash, stream.Pass(), bound_net_log,
             power_save_blocker.Pass(), observer),
           source_url_(url),
           error_info_(error_info),
           destruction_callback_(dtor_callback) {
-  ctor_callback.Run(source_url_);
+  // DownloadFiles are created on the UI thread and are destroyed on the FILE
+  // thread. Schedule the ConstructionCallback on the FILE thread so that if a
+  // DownloadItem schedules a DownloadFile to be destroyed and creates another
+  // one (as happens during download resumption), then the DestructionCallback
+  // for the old DownloadFile is run before the ConstructionCallback for the
+  // next DownloadFile.
+  BrowserThread::PostTask(
+      BrowserThread::FILE,
+      FROM_HERE,
+      base::Bind(ctor_callback, source_url_));
 }
 
 DownloadFileWithErrors::~DownloadFileWithErrors() {
+  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::FILE));
   destruction_callback_.Run(source_url_);
 }
 
 void DownloadFileWithErrors::Initialize(
     const InitializeCallback& callback) {
   DownloadInterruptReason error_to_return = DOWNLOAD_INTERRUPT_REASON_NONE;
   InitializeCallback callback_to_use = callback;
 
   // Replace callback if the error needs to be overwritten.
   if (OverwriteError(
@@ skipping 328 matching lines @@
     case FILE_OPERATION_RENAME_ANNOTATE:
       return "RENAME_ANNOTATE";
     default:
       break;
   }
 
   return "Unknown";
 }
 
 }  // namespace content