Introduce AppCacheResponseMetadataWriter to support metadata caching.

content/browser/appcache/appcache_storage.h

 // Copyright (c) 2012 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_STORAGE_H_
 #define CONTENT_BROWSER_APPCACHE_APPCACHE_STORAGE_H_
 
 #include <map>
 #include <vector>
 
 #include "base/basictypes.h"
 #include "base/compiler_specific.h"
 #include "base/gtest_prod_util.h"
 #include "base/memory/ref_counted.h"
 #include "base/memory/scoped_ptr.h"
 #include "content/browser/appcache/appcache_working_set.h"
 #include "content/common/content_export.h"
 #include "net/base/completion_callback.h"
 
 class GURL;
 
 namespace content {
 FORWARD_DECLARE_TEST(AppCacheStorageTest, DelegateReferences);
 FORWARD_DECLARE_TEST(AppCacheStorageTest, UsageMap);
 class AppCache;
 class AppCacheEntry;
 class AppCacheGroup;
 class AppCacheQuotaClientTest;
+class AppCacheResponseMetadataWriter;
 class AppCacheResponseReader;
 class AppCacheResponseTest;
 class AppCacheResponseWriter;
 class AppCacheServiceImpl;
 class AppCacheStorageTest;
 struct AppCacheInfoCollection;
 struct HttpResponseInfoIOBuffer;
 
 class CONTENT_EXPORT AppCacheStorage {
  public:
@@ skipping 123 matching lines @@
 
   // Creates a reader to read a response from storage.
   virtual AppCacheResponseReader* CreateResponseReader(
       const GURL& manifest_url, int64 group_id, int64 response_id) = 0;
 
   // Creates a writer to write a new response to storage. This call
   // establishes a new response id.
   virtual AppCacheResponseWriter* CreateResponseWriter(
       const GURL& manifest_url, int64 group_id) = 0;
 
+  // Creates a metadata writer to write metadata of response to storage.
+  virtual AppCacheResponseMetadataWriter* CreateResponseMetadataWriter(
+      int64 group_id,
+      int64 response_id) = 0;
+
   // Schedules the lazy deletion of responses and saves the ids
   // persistently such that the responses will be deleted upon restart
   // if they aren't deleted prior to shutdown.
   virtual void DoomResponses(
       const GURL& manifest_url, const std::vector<int64>& response_ids) = 0;
 
   // Schedules the lazy deletion of responses without persistently saving
   // the response ids.
   virtual void DeleteResponses(
       const GURL& manifest_url, const std::vector<int64>& response_ids) = 0;
@@ skipping 136 matching lines @@
 
   FRIEND_TEST_ALL_PREFIXES(content::AppCacheStorageTest, DelegateReferences);
   FRIEND_TEST_ALL_PREFIXES(content::AppCacheStorageTest, UsageMap);
 
   DISALLOW_COPY_AND_ASSIGN(AppCacheStorage);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_APPCACHE_APPCACHE_STORAGE_H_