Add support for fallback content for the frame. This includes main and subframes.

content/browser/appcache/appcache_request_handler.h

 // Copyright (c) 2011 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.
 
 #ifndef CONTENT_BROWSER_APPCACHE_APPCACHE_REQUEST_HANDLER_H_
 #define CONTENT_BROWSER_APPCACHE_APPCACHE_REQUEST_HANDLER_H_
 
 #include <stdint.h>
 
 #include <memory>
@@ skipping 142 matching lines @@
   // Sub-resource loading -------------------------------------
   // Dedicated worker and all manner of sub-resources are handled here.
 
   std::unique_ptr<AppCacheJob> MaybeLoadSubResource(
       net::NetworkDelegate* network_delegate);
   void ContinueMaybeLoadSubResource();
 
   // AppCacheHost::Observer override
   void OnCacheSelectionComplete(AppCacheHost* host) override;
 
-  // URLLoaderRequestHandler override
+  // Network service loading
+
+  // URLLoaderRequestHandler overrides
+  // These functions are invoked for loading AppCache content for the frame and
+  // for subresources.
   void MaybeCreateLoader(const ResourceRequest& resource_request,
                          ResourceContext* resource_context,
                          LoaderCallback callback) override;
   mojom::URLLoaderFactoryPtr MaybeCreateSubresourceFactory() override;
+  bool MaybeCreateLoaderForResponse(
+      const ResourceResponseHead& response,
+      mojom::URLLoaderPtr* loader,
+      mojom::URLLoaderClientRequest* client_request) override;
 
   // Data members -----------------------------------------------
 
   // What host we're servicing a request for.
   AppCacheHost* host_;
 
   // Frame vs subresource vs sharedworker loads are somewhat different.
   ResourceType resource_type_;
 
   // True if corresponding AppCache group should be resetted before load.
@@ skipping 50 matching lines @@
 
   // Network service related members.
 
   // In the network service world we are queried via the URLLoaderRequestHandler
   // interface to see if the navigation request can be handled via the
   // AppCache. We hold onto the AppCache job created here until the client
   // binds to it (Serviced via AppCache). If the request cannot be handled via
   // the AppCache, we delete the job.
   std::unique_ptr<AppCacheJob> navigation_request_job_;
 
-  // In the network service world, points to the getter for the network URL
-  // loader.
+  // Points to the getter for the network URL loader.
   scoped_refptr<URLLoaderFactoryGetter> network_url_loader_factory_getter_;
 
   friend class content::AppCacheRequestHandlerTest;
 
   // Subresource load information.
   std::unique_ptr<SubresourceLoadInfo> subresource_load_info_;
 
   // The AppCache host instance. We pass this to the
   // AppCacheSubresourceURLFactory instance on creation.
   base::WeakPtr<AppCacheHost> appcache_host_;
 
   DISALLOW_COPY_AND_ASSIGN(AppCacheRequestHandler);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_APPCACHE_APPCACHE_REQUEST_HANDLER_H_