Add invalidation to url_response_disk_cache.

shell/application_manager/network_fetcher.h

 // Copyright 2015 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 SHELL_APPLICATION_MANAGER_NETWORK_FETCHER_H_
 #define SHELL_APPLICATION_MANAGER_NETWORK_FETCHER_H_
 
 #include "shell/application_manager/fetcher.h"
 
 #include "base/files/file_path.h"
@@ skipping 31 matching lines @@
   std::string MimeType() override;
 
   bool HasMojoMagic() override;
 
   bool PeekFirstLine(std::string* line) override;
 
   // Returns whether the content can be loaded directly from cache. Local hosts
   // are not loaded from cache to allow effective development.
   bool CanLoadDirectlyFromCache();
 
-  void LoadFromCache(bool schedule_update);
+  // Tries to load the URL directly from the offline cache.
+  void LoadFromCache();
 
-  void OnCachedResponseReceived(bool schedule_update,
-                                mojo::URLResponsePtr response,
-                                mojo::Array<uint8_t> path_as_array,
-                                mojo::Array<uint8_t> cache_dir);
+  // Callback from the offline cache.
+  void OnResponseReceived(bool schedule_update,
+                          mojo::URLResponsePtr response,
+                          mojo::Array<uint8_t> path_as_array,
+                          mojo::Array<uint8_t> cache_dir);
 
+  // Start a network request to load the URL.
   void StartNetworkRequest();
 
+  // Callback from the network stack.
   void OnLoadComplete(mojo::URLResponsePtr response);
 
-  void OnFileSavedToCache(mojo::Array<uint8_t> path_as_array,
+  // Callback from the offline cache when the response is saved by the cache.
+  void OnFileSavedToCache(mojo::URLResponsePtr response,
+                          mojo::Array<uint8_t> path_as_array,
                           mojo::Array<uint8_t> cache_dir);
 
+  // Record the mapping from URLs to files.
   static void RecordCacheToURLMapping(const base::FilePath& path,
                                       const GURL& url);
 
   const bool disable_cache_;
   const bool force_offline_by_default_;
   const GURL url_;
   mojo::URLResponseDiskCache* url_response_disk_cache_;
   mojo::NetworkService* network_service_;
   mojo::URLLoaderPtr url_loader_;
   mojo::URLResponsePtr response_;
   base::FilePath path_;
   base::WeakPtrFactory<NetworkFetcher> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(NetworkFetcher);
 };
 
 }  // namespace shell
 
 #endif  // SHELL_APPLICATION_MANAGER_NETWORK_FETCHER_H_