MD Bookmarks: Support policies for disabling bookmark editing

chrome/browser/resources/md_bookmarks/toolbar.js

 // Copyright 2016 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.
 
 Polymer({
   is: 'bookmarks-toolbar',
 
   behaviors: [
     bookmarks.StoreClient,
   ],
 
   properties: {
     /** @private */
     searchTerm_: {
       type: String,
       observer: 'onSearchTermChanged_',
     },
 
     sidebarWidth: {
       type: String,
       observer: 'onSidebarWidthChanged_',
     },
 
     showSelectionOverlay: {
       type: Boolean,
-      computed: 'shouldShowSelectionOverlay_(selectedCount_)',
+      computed: 'shouldShowSelectionOverlay_(selectedItems_, canEdit_)',
       readOnly: true,
       reflectToAttribute: true,
     },
 
     /** @private */
     narrow_: {
       type: Boolean,
       reflectToAttribute: true,
     },
 
+    /** @private {!Set<string>} */
+    selectedItems_: Object,
+
     /** @private */
-    selectedCount_: Number,
+    canEdit_: Boolean,
+
+    /** @private */
+    selectedFolder_: String,
+
+    /** @private */
+    canChangeList_: {
+      type: Boolean,
+      computed: 'computeCanChangeList_(selectedFolder_, searchTerm_, canEdit_)',
+    }
   },
 
   attached: function() {
     this.watch('searchTerm_', function(state) {
       return state.search.term;
     });
-    this.watch('selectedCount_', function(state) {
-      return state.selection.items.size;
+    this.watch('selectedItems_', function(state) {
+      return state.selection.items;
+    });
+    this.watch('canEdit_', function(state) {
+      return state.prefs.canEdit;
+    });
+    this.watch('selectedFolder_', function(state) {
+      return state.selectedFolder;
     });
     this.updateFromStore();
   },
 
   /** @return {CrToolbarSearchFieldElement} */
   get searchField() {
     return /** @type {CrToolbarElement} */ (this.$$('cr-toolbar'))
         .getSearchField();
   },
 
@@ skipping 79 matching lines @@
 
   /** @private */
   onSearchTermChanged_: function() {
     this.searchField.setValue(this.searchTerm_ || '');
   },
 
   /**
    * @return {boolean}
    * @private
    */
-  hasSearchTerm_: function() {
-    return !!this.searchTerm_;
+  computeCanChangeList_: function() {
+    return !this.searchTerm_ &&
+        bookmarks.util.canReorderChildren(
+            this.getState(), this.selectedFolder_);
   },
 
   /**
    * @return {boolean}
    * @private
    */
   shouldShowSelectionOverlay_: function() {
-    return this.selectedCount_ > 1;
+    return this.selectedItems_.size > 1 && this.canEdit_;
+  },
+
+  canDeleteSelection_: function() {
+    return bookmarks.CommandManager.getInstance().canExecute(
+        Command.DELETE, this.selectedItems_);
   },
 
   /**
    * @return {string}
    * @private
    */
   getItemsSelectedString_: function() {
-    return loadTimeData.getStringF('itemsSelected', this.selectedCount_);
+    return loadTimeData.getStringF('itemsSelected', this.selectedItems_.size);
   },
 });