Fix integration tests in src/chrome and src/extensions so that we can turn on IO thread checks wi...

components/drive/service/fake_drive_service.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 "components/drive/service/fake_drive_service.h"
 
 #include <stddef.h>
 
 #include <memory>
 #include <string>
 #include <utility>
 #include <vector>
 
 #include "base/files/file_util.h"
 #include "base/json/json_string_value_serializer.h"
 #include "base/logging.h"
 #include "base/md5.h"
 #include "base/memory/ptr_util.h"
 #include "base/strings/string_number_conversions.h"
 #include "base/strings/string_split.h"
 #include "base/strings/string_tokenizer.h"
 #include "base/strings/string_util.h"
 #include "base/strings/stringprintf.h"
 #include "base/strings/utf_string_conversions.h"
+#include "base/threading/thread_restrictions.h"
 #include "base/threading/thread_task_runner_handle.h"
 #include "base/values.h"
 #include "components/drive/drive_api_util.h"
 #include "google_apis/drive/drive_api_parser.h"
 #include "google_apis/drive/test_util.h"
 #include "net/base/escape.h"
 #include "net/base/url_util.h"
 
 using google_apis::AboutResource;
 using google_apis::AboutResourceCallback;
@@ skipping 771 matching lines @@
                  weak_ptr_factory_.GetWeakPtr()));
   return CancelCallback();
 }
 
 CancelCallback FakeDriveService::DownloadFile(
     const base::FilePath& local_cache_path,
     const std::string& resource_id,
     const DownloadActionCallback& download_action_callback,
     const GetContentCallback& get_content_callback,
     const ProgressCallback& progress_callback) {
+  base::ThreadRestrictions::ScopedAllowIO allow_io;
   DCHECK(thread_checker_.CalledOnValidThread());
   DCHECK(!download_action_callback.is_null());
 
   if (offline_) {
     base::ThreadTaskRunnerHandle::Get()->PostTask(
         FROM_HERE,
         base::Bind(download_action_callback,
                    DRIVE_NO_CONNECTION,
                    base::FilePath()));
     return CancelCallback();
@@ skipping 1047 matching lines @@
   NOTREACHED();
   return std::unique_ptr<BatchRequestConfiguratorInterface>();
 }
 
 void FakeDriveService::NotifyObservers() {
   for (auto& observer : change_observers_)
     observer.OnNewChangeAvailable();
 }
 
 }  // namespace drive