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

content/browser/appcache/appcache_url_loader_job.h

 // Copyright (c) 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.
 
 #ifndef CONTENT_BROWSER_APPCACHE_APPCACHE_URL_LOADER_JOB_H_
 #define CONTENT_BROWSER_APPCACHE_APPCACHE_URL_LOADER_JOB_H_
 
 #include "base/logging.h"
 #include "base/memory/ref_counted.h"
 #include "base/memory/weak_ptr.h"
@@ skipping 78 matching lines @@
   void OnReceiveCachedMetadata(const std::vector<uint8_t>& data) override;
   void OnTransferSizeUpdated(int32_t transfer_size_diff) override;
   void OnStartLoadingResponseBody(
       mojo::ScopedDataPipeConsumerHandle body) override;
   void OnComplete(const ResourceRequestCompletionStatus& status) override;
 
   void set_main_resource_loader_callback(LoaderCallback callback) {
     main_resource_loader_callback_ = std::move(callback);
   }
 
+  void set_main_resource_fallback_handler(ResponseFallback fallback_handler) {
+    main_resource_fallback_handler_ = std::move(fallback_handler);
+  }
+
   // Subresource request load information is passed in the
   // |subresource_load_info| parameter. This includes the request id, the
   // client pointer, etc.
   // |default_url_loader| is used to retrieve the network loader for requests
   // intended to be sent to the network.
   void SetSubresourceLoadInfo(
       std::unique_ptr<SubresourceLoadInfo> subresource_load_info,
       URLLoaderFactoryGetter* default_url_loader);
 
   // Ownership of the |handler| is transferred to us via this call. This is
   // only for subresource requests.
   void set_request_handler(std::unique_ptr<AppCacheRequestHandler> handler) {
     sub_resource_handler_ = std::move(handler);
   }
 
+  // Binds to the URLLoaderRequest instance passed in the |request| parameter.
+  // The URLLoaderClient instance is passed in the |client| parameter. This
+  // enables the client to receive notifications/data, etc for the ensuing
+  // URL load.
+  void BindRequest(mojom::URLLoaderClientPtr client,
+                   mojom::URLLoaderRequest request);
+
  protected:
   // AppCacheJob::Create() creates this instance.
   friend class AppCacheJob;
 
   AppCacheURLLoaderJob(const ResourceRequest& request,
                        AppCacheURLLoaderRequest* appcache_request,
                        AppCacheStorage* storage);
 
   // AppCacheStorage::Delegate methods
   void OnResponseInfoLoaded(AppCacheResponseInfo* response_info,
@@ skipping 75 matching lines @@
   // Used for subresource requests which go to the network.
   mojom::URLLoaderPtr network_loader_;
 
   // Network URLLoaderClient binding for subresource requests.
   mojo::Binding<mojom::URLLoaderClient> network_loader_client_binding_;
 
   // The AppCacheURLLoaderRequest instance. We use this to set the response
   // info when we receive it.
   AppCacheURLLoaderRequest* appcache_request_;
 
+  // Contains the fallback response handler for the main resource, which is
+  // invoked by the client to request fallback responses.
+  ResponseFallback main_resource_fallback_handler_;
+
   DISALLOW_COPY_AND_ASSIGN(AppCacheURLLoaderJob);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_APPCACHE_APPCACHE_URL_LOADER_JOB_H_