BookmarkClient can add extra nodes to BookmarkModel.

components/policy/core/browser/managed_bookmarks_tracker.h

+// Copyright 2014 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 COMPONENTS_POLICY_CORE_BROWSER_MANAGED_BOOKMARKS_TRACKER_H_
+#define COMPONENTS_POLICY_CORE_BROWSER_MANAGED_BOOKMARKS_TRACKER_H_
+
+#include "base/callback_forward.h"
+#include "base/macros.h"
+#include "base/prefs/pref_change_registrar.h"
+#include "base/strings/string16.h"
+#include "components/policy/policy_export.h"
+
+class BookmarkModel;
+class BookmarkNode;
+class BookmarkPermanentNode;
+class GURL;
+class PrefService;
+
+namespace base {
+class ListValue;
+}
+
+namespace policy {
+
+// Tracks the Managed Bookmarks policy value and makes the managed_node() in
+// the BookmarkModel follow the policy-defined bookmark tree.
+class POLICY_EXPORT ManagedBookmarksTracker {
+ public:
+  typedef base::Callback<std::string()> GetManagementDomainCallback;
+
+  // Shared constants used in the policy configuration.
+  static const char kName[];
+  static const char kUrl[];
+  static const char kChildren[];
+
+  ManagedBookmarksTracker(BookmarkModel* model,
+                          PrefService* prefs,
+                          const GetManagementDomainCallback& callback);
+  ~ManagedBookmarksTracker();
+
+  // Returns the initial list of managed bookmarks, which can be passed to
+  // LoadInitial() to do the initial load.
+  scoped_ptr<base::ListValue> GetInitialManagedBookmarks();
+
+  // Loads the initial managed bookmarks in |list| into |folder|. New nodes
+  // will be assigned IDs starting at |next_node_id|.
+  // Returns the next node ID to use.
+  static int64 LoadInitial(BookmarkNode* folder,
+                           const base::ListValue* list,
+                           int64 next_node_id);
+
+  // Starts tracking the policy for updates to the managed bookmarks. Should
+  // be called after loading the initial bookmarks.
+  void Init(BookmarkPermanentNode* managed_node);
+
+ private:
+  void ReloadManagedBookmarks();
+  void UpdateBookmarks(const BookmarkNode* folder, const base::ListValue* list);
+  static bool LoadBookmark(const base::ListValue* list,
+                           size_t index,
+                           base::string16* title,
+                           GURL* url,
+                           const base::ListValue** children);
+
+  BookmarkModel* model_;
+  BookmarkPermanentNode* managed_node_;
+  PrefService* prefs_;
+  PrefChangeRegistrar registrar_;
+  GetManagementDomainCallback get_management_domain_callback_;
+
+  DISALLOW_COPY_AND_ASSIGN(ManagedBookmarksTracker);
+};
+
+}  // namespace policy
+
+#endif  // COMPONENTS_POLICY_CORE_BROWSER_MANAGED_BOOKMARKS_TRACKER_H_