BookmarkClient can add extra nodes to BookmarkModel.

chrome/browser/bookmarks/chrome_bookmark_client.h

Index: chrome/browser/bookmarks/chrome_bookmark_client.h
diff --git a/chrome/browser/bookmarks/chrome_bookmark_client.h b/chrome/browser/bookmarks/chrome_bookmark_client.h
index bf079d7e234f6357a993402f6f69aee5a9970c77..512178baddc68e7b70776cffaa9deddcbaf90a32 100644
--- a/chrome/browser/bookmarks/chrome_bookmark_client.h
+++ b/chrome/browser/bookmarks/chrome_bookmark_client.h
@@ -40,8 +40,16 @@ class ChromeBookmarkClient : public BookmarkClient,
   virtual void GetTypedCountForNodes(
       const NodeSet& nodes,
       NodeTypedCountPairs* node_typed_count_pairs) OVERRIDE;
-  virtual bool IsPermanentNodeVisible(int node_type) OVERRIDE;
+  virtual bool IsPermanentNodeVisible(
+      const BookmarkPermanentNode* node) OVERRIDE;
   virtual void RecordAction(const base::UserMetricsAction& action) OVERRIDE;
+  virtual bookmarks::LoadExtraCallback GetLoadExtraNodesCallback() OVERRIDE;
+  virtual bool CanRemovePermanentNodeChildren(
+      const BookmarkNode* node) OVERRIDE;
+  virtual bool CanSetPermanentNodeTitle(
+      const BookmarkNode* permanent_node) OVERRIDE;
+  virtual bool CanSyncNode(const BookmarkNode* node) OVERRIDE;
+  virtual bool CanReorderChildren(const BookmarkNode* parent) OVERRIDE;
 
   // content::NotificationObserver:
   virtual void Observe(int type,
@@ -63,6 +71,9 @@ class ChromeBookmarkClient : public BookmarkClient,
       BookmarkModel* model,
       const std::set<GURL>& removed_urls) OVERRIDE;
 
+  // Helper for GetLoadExtraNodesCallback().
+  static bookmarks::BookmarkPermanentNodeList LoadExtraNodes(int64* next_id);
+
   Profile* profile_;
 
   content::NotificationRegistrar registrar_;