[reference - do not submit] Always create four pools in TaskSchedulerImpl.

content/public/browser/content_browser_client.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/browser/content_browser_client.h"
 
 #include "base/files/file_path.h"
 #include "base/guid.h"
 #include "base/logging.h"
 #include "build/build_config.h"
@@ skipping 428 matching lines @@
 
 std::unique_ptr<MemoryCoordinatorDelegate>
 ContentBrowserClient::GetMemoryCoordinatorDelegate() {
   return std::unique_ptr<MemoryCoordinatorDelegate>();
 }
 
 ::rappor::RapporService* ContentBrowserClient::GetRapporService() {
   return nullptr;
 }
 
+std::unique_ptr<base::TaskSchedulerInitParams>
+ContentBrowserClient::GetTaskSchedulerInitParams() {
+  return nullptr;
+}
+
 bool ContentBrowserClient::ShouldRedirectDOMStorageTaskRunner() {
   return false;
 }
 
 bool ContentBrowserClient::RedirectNonUINonIOBrowserThreadsToTaskScheduler() {
   return false;
 }
 
 }  // namespace content