Allow embedder to force visibility of permanent nodes

components/bookmarks/core/browser/bookmark_model.h

Index: components/bookmarks/core/browser/bookmark_model.h
diff --git a/components/bookmarks/core/browser/bookmark_model.h b/components/bookmarks/core/browser/bookmark_model.h
index 4c4a313940213249c08e94fe657089e00dca64a7..818929f6ac466060e7d902f1fdfe55331d548b60 100644
--- a/components/bookmarks/core/browser/bookmark_model.h
+++ b/components/bookmarks/core/browser/bookmark_model.h
@@ -250,9 +250,14 @@ class BookmarkModel : public BookmarkService {
     return expanded_state_tracker_.get();
   }
 
-  // Sets the visibility of one of the permanent nodes. This is set by sync.
+  // Sets the visibility of one of the permanent nodes (unless the node must
+  // always be visible, see |BookmarkClient::IsPermanentNodeVisible| for more
+  // details). This is set by sync.
   void SetPermanentNodeVisible(BookmarkNode::Type type, bool value);
 
+  // Returns the permanent node of type |type|.
+  const BookmarkPermanentNode* PermanentNode(BookmarkNode::Type type);
+
   // Sets/deletes meta info of |node|.
   void SetNodeMetaInfo(const BookmarkNode* node,
                        const std::string& key,
@@ -372,8 +377,8 @@ class BookmarkModel : public BookmarkService {
   // Whether the initial set of data has been loaded.
   bool loaded_;
 
-  // The root node. This contains the bookmark bar node and the 'other' node as
-  // children.
+  // The root node. This contains the bookmark bar node, the 'other' node and
+  // the mobile node as children.
   BookmarkNode root_;
 
   BookmarkPermanentNode* bookmark_bar_node_;