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 "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,
+                  int frame_id);
 
+  void set_process_id(int pid) { process_id_ = pid; }
   int process_id() const { return process_id_; }
 
+  void set_frame_id(int id) { frame_id_ = id; }
+  int frame_id() const { return frame_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_t cache_document_was_loaded_from,
                    const GURL& manifest_url);
@@ skipping 20 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);
 
+  // PlzNavigate:
+  // When a navigation commits, we need to switch the AppCacheFrontend and
+  // possibly the AppCacheServiceImpl instance we are registered with.

[michaeln, 2016/11/22 00:17:27]

under what circumstances would we need to swap the appcacheService?

[ananta, 2016/11/23 04:05:14]

IsolatedApps is one case. Need to look into why that happens. This  function has
been removed though.

+  void FrameNavigationCommitted(AppCacheFrontend* frontend,
+                                AppCacheServiceImpl* service);
+
+  // PlzNavigate:
+  // Copies hosts registered with the AppCacheBackend passed in the |backend|
+  // parameter.
+  void CopyExistingHosts(AppCacheBackendImpl* backend);
+
  private:
   AppCacheServiceImpl* service_;
   AppCacheFrontend* frontend_;
   int process_id_;
+  // For PlzNavigate, this contains the frame id when the navigation is
+  // initiated.
+  int frame_id_;
   HostMap hosts_;
 
   DISALLOW_COPY_AND_ASSIGN(AppCacheBackendImpl);
 };
 
 }  // namespace
 
 #endif  // CONTENT_BROWSER_APPCACHE_APPCACHE_BACKEND_IMPL_H_