BookmarkClient can add extra nodes to BookmarkModel.

components/bookmarks/browser/bookmark_client.h

Index: components/bookmarks/browser/bookmark_client.h
diff --git a/components/bookmarks/browser/bookmark_client.h b/components/bookmarks/browser/bookmark_client.h
index ffdb64c25093a7409b31cecb03602d7c73e7e737..97bb04771919df7d936a6067558c90531bec7010 100644
--- a/components/bookmarks/browser/bookmark_client.h
+++ b/components/bookmarks/browser/bookmark_client.h
@@ -11,9 +11,11 @@
 
 #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 {
@@ -55,14 +57,31 @@ class BookmarkClient {
       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() {}
 };