Temporarily whitelist DirectoryLister, which is blocking the IO thread.

net/base/directory_lister.cc

 // Copyright (c) 2009 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 "net/base/directory_lister.h"
 
 #include <algorithm>
 #include <vector>
 
 #include "base/file_util.h"
 #include "base/i18n/file_util_icu.h"
 #include "base/message_loop.h"
 #include "base/platform_thread.h"
+#include "base/thread_restrictions.h"
 #include "net/base/net_errors.h"
 
 namespace net {
 
 static const int kFilesPerEvent = 8;
 
 // A task which is used to signal the delegate asynchronously.
 class DirectoryDataEvent : public Task {
 public:
   explicit DirectoryDataEvent(DirectoryLister* d) : lister(d), error(0) {
@@ skipping 91 matching lines @@
       recursive_(recursive),
       delegate_(delegate),
       sort_(sort),
       message_loop_(NULL),
       thread_(kNullThreadHandle) {
   DCHECK(!dir.value().empty());
 }
 
 DirectoryLister::~DirectoryLister() {
   if (thread_) {
+    // This is a bug and we should stop joining this thread.
+    // http://crbug.com/65331
+    base::ThreadRestrictions::ScopedAllowIO allow_io;
     PlatformThread::Join(thread_);
   }
 }
 
 bool DirectoryLister::Start() {
   // spawn a thread to enumerate the specified directory
 
   // pass events back to the current thread
   message_loop_ = MessageLoop::current();
   DCHECK(message_loop_) << "calling thread must have a message loop";
@@ skipping 88 matching lines @@
   // If canceled is set, we need to report some kind of error,
   // but don't overwrite the error condition if it is already set.
   if (!error && canceled_.IsSet())
     error = net::ERR_ABORTED;
 
   if (delegate_)
     delegate_->OnListDone(error);
 }
 
 }  // namespace net