MD Bookmarks: Support policies for disabling bookmark editing

chrome/test/data/webui/md_bookmarks/util_test.js

 // Copyright 2017 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 suite('util', function() {
   test('getDescendants collects all children', function() {
     var nodes = testTree(createFolder('0', [
       createFolder('1', []),
       createFolder(
           '2',
@@ skipping 41 matching lines @@
     assertFalse(map['2']);
   });
 
   test('removeIdsFromSet', function() {
     var set = new Set(['1', '3', '5']);
     var toRemove = new Set(['1', '2', '3']);
 
     var newSet = bookmarks.util.removeIdsFromSet(set, toRemove);
     assertDeepEquals(['5'], normalizeSet(newSet));
   });
+
+  test('canEditNode and canReorderChildren', function() {
+    var store = new bookmarks.TestStore({
+      nodes: testTree(
+          createFolder(
+              '1',
+              [
+                createItem('11'),
+              ]),
+          createFolder(
+              '4',
+              [
+                createItem('41', {unmodifiable: 'managed'}),
+              ],
+              {unmodifiable: 'managed'})),
+    });
+
+    // Top-level folders are unmodifiable, but their children can be changed.
+    assertFalse(bookmarks.util.canEditNode(store.data, '1'));
+    assertTrue(bookmarks.util.canReorderChildren(store.data, '1'));
+
+    // Managed folders are entirely unmodifiable.
+    assertFalse(bookmarks.util.canEditNode(store.data, '4'));
+    assertFalse(bookmarks.util.canReorderChildren(store.data, '4'));
+    assertFalse(bookmarks.util.canEditNode(store.data, '41'));
+    assertFalse(bookmarks.util.canReorderChildren(store.data, '41'));
+
+    // Regular nodes are modifiable.
+    assertTrue(bookmarks.util.canEditNode(store.data, '11'));
+    assertTrue(bookmarks.util.canReorderChildren(store.data, '11'));
+
+    // When editing is disabled globally, everything is unmodifiable.
+    store.data.prefs.canEdit = false;
+
+    assertFalse(bookmarks.util.canEditNode(store.data, '1'));
+    assertFalse(bookmarks.util.canReorderChildren(store.data, '1'));
+
+    assertFalse(bookmarks.util.canEditNode(store.data, '41'));
+    assertFalse(bookmarks.util.canReorderChildren(store.data, '41'));
+
+    assertFalse(bookmarks.util.canEditNode(store.data, '11'));
+    assertFalse(bookmarks.util.canReorderChildren(store.data, '11'));
+  });
 });