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diff --git a/content/browser/appcache/appcache_backend_impl.h b/content/browser/appcache/appcache_backend_impl.h
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+++ b/content/browser/appcache/appcache_backend_impl.h
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+// 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_BACKEND_IMPL_H_
+#define CONTENT_BROWSER_APPCACHE_APPCACHE_BACKEND_IMPL_H_
+
+#include "base/containers/hash_tables.h"
+#include "content/browser/appcache/appcache_host.h"
+#include "content/common/content_export.h"
+
+namespace content {
+
+class AppCacheServiceImpl;
+
+class CONTENT_EXPORT AppCacheBackendImpl {
+ public:
+  AppCacheBackendImpl();
+  ~AppCacheBackendImpl();
+
+  void Initialize(AppCacheServiceImpl* service,
+                  AppCacheFrontend* frontend,
+                  int process_id);
+
+  int process_id() const { return process_id_; }
+
+  // Methods to support the AppCacheBackend interface. A false return
+  // value indicates an invalid host_id and that no action was taken
+  // by the backend impl.
+  bool RegisterHost(int host_id);
+  bool UnregisterHost(int host_id);
+  bool SetSpawningHostId(int host_id, int spawning_host_id);
+  bool SelectCache(int host_id,
+                   const GURL& document_url,
+                   const int64 cache_document_was_loaded_from,
+                   const GURL& manifest_url);
+  void GetResourceList(
+      int host_id, std::vector<AppCacheResourceInfo>* resource_infos);
+  bool SelectCacheForWorker(int host_id, int parent_process_id,
+                            int parent_host_id);
+  bool SelectCacheForSharedWorker(int host_id, int64 appcache_id);
+  bool MarkAsForeignEntry(int host_id, const GURL& document_url,
+                          int64 cache_document_was_loaded_from);
+  bool GetStatusWithCallback(int host_id, const GetStatusCallback& callback,
+                             void* callback_param);
+  bool StartUpdateWithCallback(int host_id, const StartUpdateCallback& callback,
+                               void* callback_param);
+  bool SwapCacheWithCallback(int host_id, const SwapCacheCallback& callback,
+                             void* callback_param);
+
+  // Returns a pointer to a registered host. The backend retains ownership.
+  AppCacheHost* GetHost(int host_id) {
+    HostMap::iterator it = hosts_.find(host_id);
+    return (it != hosts_.end()) ? (it->second) : NULL;
+  }
+
+  typedef base::hash_map<int, AppCacheHost*> HostMap;
+  const HostMap& hosts() { return hosts_; }
+
+  // Methods to support cross site navigations. Hosts are transferred
+  // from process to process accordingly, deparented from the old
+  // processes backend and reparented to the new.
+  scoped_ptr<AppCacheHost> TransferHostOut(int host_id);
+  void TransferHostIn(int new_host_id, scoped_ptr<AppCacheHost> host);
+
+ private:
+  AppCacheServiceImpl* service_;
+  AppCacheFrontend* frontend_;
+  int process_id_;
+  HostMap hosts_;
+};
+
+}  // namespace
+
+#endif  // CONTENT_BROWSER_APPCACHE_APPCACHE_BACKEND_IMPL_H_