PlzNavigate: AppCache support.

content/browser/appcache/appcache_backend_impl.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_BACKEND_IMPL_H_
 #define CONTENT_BROWSER_APPCACHE_APPCACHE_BACKEND_IMPL_H_
 
 #include <stdint.h>
+#include <set>
 
 #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 {
@@ skipping 40 matching lines @@
 
   typedef base::hash_map<int, std::unique_ptr<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.
   std::unique_ptr<AppCacheHost> TransferHostOut(int host_id);
   void TransferHostIn(int new_host_id, std::unique_ptr<AppCacheHost> host);
 
+  // PlzNaviate
+  // The AppCacheHost is precreated by the AppCacheNavigationHandleCore class
+  // when a navigation is initiated. We register the host with the backend in
+  // this function and ignore registrations for this host id from the renderer.
+  void RegisterPrecreatedHost(std::unique_ptr<AppCacheHost> host);
+
  private:
   AppCacheServiceImpl* service_;
   AppCacheFrontend* frontend_;
   int process_id_;
   HostMap hosts_;
 
+  // PlzNavigate: Contains a list of pending hosts which have been registered
+  // via the RegisterPendingHost() function. The host is removed from the list
+  // when the RegisterHost() function is called.
+  std::set<int> pending_hosts_;
+
   DISALLOW_COPY_AND_ASSIGN(AppCacheBackendImpl);
 };
 
 }  // namespace
 
 #endif  // CONTENT_BROWSER_APPCACHE_APPCACHE_BACKEND_IMPL_H_