Get main frame and subframe AppCache loads to work.

content/browser/url_loader_factory_getter.cc

 // Copyright 2017 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/browser/url_loader_factory_getter.h"
 
 #include "base/bind.h"
 #include "content/browser/appcache/appcache_url_loader_factory.h"
 #include "content/browser/storage_partition_impl.h"
 #include "content/common/network_service.mojom.h"
@@ skipping 37 matching lines @@
 }
 
 URLLoaderFactoryGetter::~URLLoaderFactoryGetter() {}
 
 void URLLoaderFactoryGetter::InitializeOnIOThread(
     mojom::URLLoaderFactoryPtrInfo network_factory,
     scoped_refptr<ChromeAppCacheService> appcache_service) {
   network_factory_.Bind(std::move(network_factory));
 
   AppCacheURLLoaderFactory::CreateURLLoaderFactory(
-      mojo::MakeRequest(&appcache_factory_), appcache_service.get(), this);
+      mojo::MakeRequest(&appcache_factory_), appcache_service.get(), this, -1);

[jam, 2017/05/24 15:29:02]

nit: i think the convention is that 0 is ID of browser process (-1 is invalid)

 }
 
 void URLLoaderFactoryGetter::SetTestNetworkFactoryOnIOThread(
     mojom::URLLoaderFactoryPtrInfo test_factory) {
   test_factory_.Bind(std::move(test_factory));
 }
 
 }  // namespace content