In BlobURLRequestJob, open files asynchronously to avoid blocking the IO thread

webkit/tools/test_shell/simple_resource_loader_bridge.cc

 // Copyright (c) 2011 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.
 //
 // This file contains an implementation of the ResourceLoaderBridge class.
 // The class is implemented using net::URLRequest, meaning it is a "simple"
 // version that directly issues requests. The more complicated one used in the
 // browser uses IPC.
 //
 // Because net::URLRequest only provides an asynchronous resource loading API,
@@ skipping 84 matching lines @@
 };
 
 static net::URLRequestJob* BlobURLRequestJobFactory(net::URLRequest* request,
                                                     const std::string& scheme) {
   webkit_blob::BlobStorageController* blob_storage_controller =
       static_cast<TestShellRequestContext*>(request->context())->
           blob_storage_controller();
   return new webkit_blob::BlobURLRequestJob(
       request,
       blob_storage_controller->GetBlobDataFromUrl(request->url()),
-      NULL);
+      SimpleResourceLoaderBridge::GetIoThread());
 }
 
 TestShellRequestContextParams* g_request_context_params = NULL;
 TestShellRequestContext* g_request_context = NULL;
 base::Thread* g_cache_thread = NULL;
 
 //-----------------------------------------------------------------------------
 
 class IOThread : public base::Thread {
  public:
@@ skipping 799 matching lines @@
 
 // static
 scoped_refptr<base::MessageLoopProxy>
     SimpleResourceLoaderBridge::GetIoThread() {
   if (!EnsureIOThread()) {
     LOG(DFATAL) << "Failed to create IO thread.";
     return NULL;
   }
   return g_io_thread->message_loop_proxy();
 }