MD Bookmarks: Support policies for disabling bookmark editing

chrome/browser/resources/md_bookmarks/util.js

Index: chrome/browser/resources/md_bookmarks/util.js
diff --git a/chrome/browser/resources/md_bookmarks/util.js b/chrome/browser/resources/md_bookmarks/util.js
index 2a9de6a1ab7041c2a8fba9e3fe326c3f60ccdc0b..4b581e49c1bb115a0959b1b2bd762b2003fbbf2d 100644
--- a/chrome/browser/resources/md_bookmarks/util.js
+++ b/chrome/browser/resources/md_bookmarks/util.js
@@ -71,6 +71,7 @@ cr.define('bookmarks.util', function() {
       selectedFolder: '0',
       closedFolders: new Set(),
       prefs: {
+        canEdit: true,
         incognitoAvailability: IncognitoAvailability.ENABLED,
       },
       search: {
@@ -93,6 +94,33 @@ cr.define('bookmarks.util', function() {
     return !!state.search.term && !state.search.inProgress;
   }
 
+  /**
+   * Returns true if the node with ID |itemId| is modifiable, allowing
+   * the node to be renamed, moved or deleted. Note that if a node is
+   * uneditable, it may still have editable children (for example, the top-level
+   * folders).
+   * @param {BookmarksPageState} state
+   * @param {string} itemId
+   * @return {boolean}
+   */
+  function canEditNode(state, itemId) {
+    return itemId != ROOT_NODE_ID &&
+        state.nodes[itemId].parentId != ROOT_NODE_ID &&
+        !state.nodes[itemId].unmodifiable && state.prefs.canEdit;
+  }
+
+  /**
+   * Returns true if it is possible to modify the children list of the node with
+   * ID |itemId|. This includes rearranging the children or adding new ones.
+   * @param {BookmarksPageState} state
+   * @param {string} itemId
+   * @return {boolean}
+   */
+  function canReorderChildren(state, itemId) {
+    return itemId != ROOT_NODE_ID && !state.nodes[itemId].unmodifiable &&
+        state.prefs.canEdit;
+  }
+
   /**
    * @param {string} id
    * @param {NodeMap} nodes
@@ -166,6 +194,8 @@ cr.define('bookmarks.util', function() {
   }
 
   return {
+    canEditNode: canEditNode,
+    canReorderChildren: canReorderChildren,
     createEmptyState: createEmptyState,
     getDescendants: getDescendants,
     getDisplayedList: getDisplayedList,