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..341c689dddb74eba4382059b08c6101be6b941dd 100644
--- a/components/bookmarks/browser/bookmark_client.h
+++ b/components/bookmarks/browser/bookmark_client.h
@@ -6,6 +6,7 @@
 #define COMPONENTS_BOOKMARKS_BROWSER_BOOKMARK_CLIENT_H_
 
 #include <set>
+#include <string>
 #include <utility>
 #include <vector>
 
@@ -63,6 +64,12 @@ class BookmarkClient {
   // that ensure that the action is posted from the correct thread.
   virtual void RecordAction(const base::UserMetricsAction& action) = 0;
 
+  // Returns the domain name for the managed bookmarks folder. This domain is
+  // displayed only when the managed bookmarks come from a management domain;
+  // if they come from platform or MDM policy then a default name should be
+  // used instead.
+  virtual std::string GetManagedBookmarksDomain();
+
  protected:
   virtual ~BookmarkClient() {}
 };