[MD Bookmarks] Flatten sidebar.

chrome/browser/resources/md_bookmarks/types.js

Index: chrome/browser/resources/md_bookmarks/types.js
diff --git a/chrome/browser/resources/md_bookmarks/types.js b/chrome/browser/resources/md_bookmarks/types.js
index 63c4f07a20c64cf0f721e71fe6937bff1f040317..f7256132c1d1ddef3666214c24735150f92dff81 100644
--- a/chrome/browser/resources/md_bookmarks/types.js
+++ b/chrome/browser/resources/md_bookmarks/types.js
@@ -44,16 +44,31 @@ var SelectionState;
  */
 var SearchState;
 
-/** @typedef {!Object<string, boolean>} */
-var ClosedFolderState;
+/**
+ * @typedef{{
+ *   id: string,
+ *   depth: number,
+ *   open: boolean,
+ *   visible: boolean,
+ * }}
+ */
+var SidebarFolder;
+
+/**
+ * @typedef{{
+ *   folders: !Array<SidebarFolder>,
+ *   folderMap: !Object<string, number>,
+ * }}
+ */
+var SidebarState;
 
 /**
  * @typedef{{
  *   nodes: NodeList,
  *   selectedFolder: ?string,
- *   closedFolders: ClosedFolderState,
  *   search: !SearchState,
  *   selection: !SelectionState,
+ *   sidebar: !SidebarState,
  * }}
  */
 var BookmarksPageState;