Add AssignmentSource to BlimpClientContextImpl

chrome/browser/android/blimp/blimp_client_context_factory.cc

 // Copyright 2016 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 "chrome/browser/android/blimp/blimp_client_context_factory.h"
 
 #include "base/memory/singleton.h"
 #include "base/supports_user_data.h"
 #include "blimp/client/public/blimp_client_context.h"
 #include "components/keyed_service/content/browser_context_dependency_manager.h"
@@ skipping 17 matching lines @@
     : BrowserContextKeyedServiceFactory(
           "blimp::client::BlimpClientContext",
           BrowserContextDependencyManager::GetInstance()) {}
 
 BlimpClientContextFactory::~BlimpClientContextFactory() {}
 
 KeyedService* BlimpClientContextFactory::BuildServiceInstanceFor(
     content::BrowserContext* context) const {
   return blimp::client::BlimpClientContext::Create(
       content::BrowserThread::GetTaskRunnerForThread(
-          content::BrowserThread::IO));
+          content::BrowserThread::IO),
+      content::BrowserThread::GetTaskRunnerForThread(
+          content::BrowserThread::FILE));
 }
 
 content::BrowserContext* BlimpClientContextFactory::GetBrowserContextToUse(
     content::BrowserContext* context) const {
   return context;
 }