MD Bookmarks: Support policies for disabling bookmark editing

chrome/browser/resources/md_bookmarks/reducers.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.
 
 /**
  * @fileoverview Module of functions which produce a new page state in response
  * to an action. Reducers (in the same sense as Array.prototype.reduce) must be
  * pure functions: they must not modify existing state objects, or make any API
  * calls.
  */
@@ skipping 390 matching lines @@
    * @param {PreferencesState} prefs
    * @param {Action} action
    * @return {PreferencesState}
    */
   PreferencesState.updatePrefs = function(prefs, action) {
     switch (action.name) {
       case 'set-incognito-availability':
         return /** @type {PreferencesState} */ (Object.assign({}, prefs, {
           incognitoAvailability: action.value,
         }));
+      case 'set-can-edit':
+        return /** @type {PreferencesState} */ (Object.assign({}, prefs, {
+          canEdit: action.value,
+        }));
       default:
         return prefs;
     }
   };
 
   /**
    * @param {ClosedFolderState} closedFolders
    * @param {Action} action
    * @param {NodeMap} nodes
    * @return {ClosedFolderState}
@@ skipping 43 matching lines @@
   return {
     reduceAction: reduceAction,
     ClosedFolderState: ClosedFolderState,
     NodeState: NodeState,
     PreferencesState: PreferencesState,
     SearchState: SearchState,
     SelectedFolderState: SelectedFolderState,
     SelectionState: SelectionState,
   };
 });