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).

[calamity, 2017/06/13 05:13:53]

Might also be worth mentioning that the unmodifiable nodes are going to be top
level folders and anything beneath the managed bookmarks folder (if that's all
that this will ever apply to).

[tsergeant, 2017/06/13 05:32:16]

I think that comment will probably just end up restating the actual code, which
I'd probably rather avoid.

+   * @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,