Provide skeleton functionality for AppCache handling in the network service.

content/browser/appcache/appcache_request_handler.cc

Index: content/browser/appcache/appcache_request_handler.cc
diff --git a/content/browser/appcache/appcache_request_handler.cc b/content/browser/appcache/appcache_request_handler.cc
index 870fa7d35200c73a52989a24241190d1cd360aa3..3b34b5ac1d6929657aeb01395ca90d795237f89c 100644
--- a/content/browser/appcache/appcache_request_handler.cc
+++ b/content/browser/appcache/appcache_request_handler.cc
@@ -9,6 +9,7 @@
 #include "base/bind.h"
 #include "content/browser/appcache/appcache.h"
 #include "content/browser/appcache/appcache_backend_impl.h"
+#include "content/browser/appcache/appcache_network_service_handler.h"
 #include "content/browser/appcache/appcache_policy.h"
 #include "content/browser/appcache/appcache_request.h"
 #include "content/browser/appcache/appcache_url_request_job.h"
@@ -223,6 +224,24 @@ void AppCacheRequestHandler::MaybeCompleteCrossSiteTransferInOldProcess(
   CompleteCrossSiteTransfer(old_process_id_, old_host_id_);
 }
 
+// static.
+void AppCacheRequestHandler::InitializeForNavigationNetworkService(
+    std::unique_ptr<ResourceRequest> resource_request,
+    ResourceContext* resource_context,
+    AppCacheNavigationHandleCore* navigation_handle_core,
+    ResourceType resource_type,
+    base::Callback<void(mojom::URLLoaderFactoryPtrInfo,
+                        std::unique_ptr<ResourceRequest>)> callback) {
+  // This instance is deleted when it receives a callback from the
+  // AppCacheStorage class which contains information about the AppCache
+  // status for the URL being served by the |resource_request|.
+  AppCacheNetworkServiceHandler* network_service_handler =
+      new AppCacheNetworkServiceHandler(
+          std::move(resource_request), resource_context, navigation_handle_core,
+          resource_type, callback);
+  network_service_handler->Start();
+}
+
 void AppCacheRequestHandler::OnDestructionImminent(AppCacheHost* host) {
   storage()->CancelDelegateCallbacks(this);
   host_ = NULL;  // no need to RemoveObserver, the host is being deleted