Experimental bookmark model based on tags.

chrome/browser/bookmarks/bookmark_model_observer.h

Index: chrome/browser/bookmarks/bookmark_model_observer.h
diff --git a/chrome/browser/bookmarks/bookmark_model_observer.h b/chrome/browser/bookmarks/bookmark_model_observer.h
index 31bd2e71971b5fbae335a0e8c27fa126e5d75b38..aea1a0ad2e76ee5b62edc23d86a96dde28908bd6 100644
--- a/chrome/browser/bookmarks/bookmark_model_observer.h
+++ b/chrome/browser/bookmarks/bookmark_model_observer.h
@@ -57,6 +57,14 @@ class BookmarkModelObserver {
   virtual void BookmarkNodeChanged(BookmarkModel* model,
                                    const BookmarkNode* node) = 0;
 
+  // Invoked before the metainfo of a node is changed.
+  virtual void OnWillChangeBookmarkMetaInfo(BookmarkModel* model,
+                                            const BookmarkNode* node) {}
+
+  // Invoked when the metainfo on a node changes.
+  virtual void BookmarkMetaInfoChanged(BookmarkModel* model,
+                                       const BookmarkNode* node) {}
+
   // Invoked when a favicon has been loaded or changed.
   virtual void BookmarkNodeFaviconChanged(BookmarkModel* model,
                                           const BookmarkNode* node) = 0;