BookmarkClient can add extra nodes to BookmarkModel.

components/bookmarks/browser/bookmark_client.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_BOOKMARKS_BROWSER_BOOKMARK_CLIENT_H_
 #define COMPONENTS_BOOKMARKS_BROWSER_BOOKMARK_CLIENT_H_
 
 #include <set>
 #include <utility>
 #include <vector>
 
 #include "base/callback_forward.h"
 #include "base/task/cancelable_task_tracker.h"
+#include "components/bookmarks/browser/bookmark_storage.h"
 #include "components/favicon_base/favicon_callback.h"
 
 class BookmarkNode;
+class BookmarkPermanentNode;
 class GURL;
 
 namespace base {
 struct UserMetricsAction;
 }
 
 // This class abstracts operations that depends on the embedder's environment,
 // e.g. Chrome.
 class BookmarkClient {
  public:
@@ skipping 21 matching lines @@
 
   // Returns true if the embedder supports typed count for URL.
   virtual bool SupportsTypedCountForNodes();
 
   // Retrieves the number of time each BookmarkNode URL has been typed in
   // the Omnibox by the user.
   virtual void GetTypedCountForNodes(
       const NodeSet& nodes,
       NodeTypedCountPairs* node_typed_count_pairs);
 
-  // Returns whether the embedder wants permanent node of type |node_type|
+  // Returns whether the embedder wants permanent node |node|
   // to always be visible or to only show them when not empty.
-  virtual bool IsPermanentNodeVisible(int node_type) = 0;
+  virtual bool IsPermanentNodeVisible(const BookmarkPermanentNode* node) = 0;
 
   // Wrapper around RecordAction defined in base/metrics/user_metrics.h
   // that ensure that the action is posted from the correct thread.
   virtual void RecordAction(const base::UserMetricsAction& action) = 0;
 
+  // Returns a task that will be used to load any additional root nodes. This
+  // task will be invoked in the Profile's IO task runner.
+  virtual bookmarks::LoadExtraCallback GetLoadExtraNodesCallback() = 0;
+
+  // Checks if the children of the given permanent |node| can be removed from
+  // the bookmark model.
+  virtual bool CanRemovePermanentNodeChildren(const BookmarkNode* node) = 0;
+
+  // Checks if the |permanent_node| can have its title updated.
+  virtual bool CanSetPermanentNodeTitle(const BookmarkNode* permanent_node) = 0;
+
+  // Checks if |node| should sync.
+  virtual bool CanSyncNode(const BookmarkNode* node) = 0;
+
+  // Checks if the children of |parent| can be reordered or sorted.
+  virtual bool CanReorderChildren(const BookmarkNode* parent) = 0;
+
  protected:
   virtual ~BookmarkClient() {}
 };
 
 #endif  // COMPONENTS_BOOKMARKS_BROWSER_BOOKMARK_CLIENT_H_