PlzNavigate: AppCache support.

content/browser/appcache/appcache_navigation_handle_core.h

+// Copyright 2016 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_NAVIGATION_HANDLE_CORE_H_
+#define CONTENT_BROWSER_APPCACHE_APPCACHE_NAVIGATION_HANDLE_CORE_H_
+
+#include <memory>
+
+#include "base/macros.h"
+#include "base/memory/ref_counted.h"
+#include "base/memory/weak_ptr.h"
+#include "content/common/appcache_interfaces.h"
+
+namespace content {
+
+class AppCacheNavigationHandle;
+class AppCacheHost;
+class AppCacheServiceImpl;
+class ChromeAppCacheService;
+
+// PlzNavigate
+// This class is used to manage the lifetime of AppCacheHosts
+// created during navigations. This class is created on the UI thread, but
+// should only be accessed from the IO thread afterwards. It is the IO thread
+// pendant of AppCacheNavigationHandle. See the
+// AppCacheNavigationHandle header for more details about the lifetime of
+// both classes.
+class AppCacheNavigationHandleCore : public AppCacheFrontend {
+ public:
+  AppCacheNavigationHandleCore(
+      base::WeakPtr<AppCacheNavigationHandle> ui_handle,
+      ChromeAppCacheService* appcache_service,
+      int appcache_host_id);
+  ~AppCacheNavigationHandleCore() override;
+
+  // Returns the raw AppCacheHost pointer. Ownership remains with this class.
+  AppCacheHost* host() { return precreated_host_.get(); }
+
+  // Initializes this instance. Should be called on the IO thread.
+  void Initialize();
+
+  // Called when a navigation is committed. The |process_id| parameter is
+  // is the process id of the renderer.
+  void CommitNavigation(int process_id);
+
+  AppCacheServiceImpl* GetAppCacheService();
+
+  // AppCacheFrontend methods

[michaeln, 2016/12/03 00:58:58]

i'd vote to make these 'private' or 'protected' since they're not intended to be
called thru AppCacheNavigationHandleCore instance ptrs, the reason to implement
this intf is a an impl detail

[ananta, 2016/12/03 14:55:04]

Changed to protected:

+  // We don't expect calls on the AppCacheFrontend methods while the
+  // AppCacheHost is not registered with the AppCacheBackend.
+  void OnCacheSelected(int host_id, const AppCacheInfo& info) override;
+  void OnStatusChanged(const std::vector<int>& host_ids,
+                       AppCacheStatus status) override;
+  void OnEventRaised(const std::vector<int>& host_ids,
+                     AppCacheEventID event_id) override;
+  void OnProgressEventRaised(const std::vector<int>& host_ids,
+                             const GURL& url,
+                             int num_total,
+                             int num_complete) override;
+  void OnErrorEventRaised(const std::vector<int>& host_ids,
+                          const AppCacheErrorDetails& details) override;
+  void OnLogMessage(int host_id,
+                    AppCacheLogLevel log_level,
+                    const std::string& message) override;
+  void OnContentBlocked(int host_id, const GURL& manifest_url) override;
+
+ private:
+  std::unique_ptr<AppCacheHost> precreated_host_;
+  scoped_refptr<ChromeAppCacheService> appcache_service_;
+  int appcache_host_id_;
+  base::WeakPtr<AppCacheNavigationHandle> ui_handle_;
+
+  DISALLOW_COPY_AND_ASSIGN(AppCacheNavigationHandleCore);
+};
+
+}  // namespace content
+
+#endif  // CONTENT_BROWSER_APPCACHE_APPCACHE_NAVIGATION_HANDLE_CORE_H_