MD Bookmarks: Support policies for disabling bookmark editing

chrome/browser/resources/md_bookmarks/dnd_manager.js

Index: chrome/browser/resources/md_bookmarks/dnd_manager.js
diff --git a/chrome/browser/resources/md_bookmarks/dnd_manager.js b/chrome/browser/resources/md_bookmarks/dnd_manager.js
index a4423b3d66b89aa10cdd4e9f55c7bd8711cac4a3..71b1bcde1da76d1ec6d9c480ed6bf02d73021274 100644
--- a/chrome/browser/resources/md_bookmarks/dnd_manager.js
+++ b/chrome/browser/resources/md_bookmarks/dnd_manager.js
@@ -426,6 +426,13 @@ cr.define('bookmarks', function() {
 
       e.preventDefault();
 
+      // If any node can't be dragged, early return (after preventDefault).
+      var anyUnmodifiable = draggedNodes.some(function(itemId) {
+        return !bookmarks.util.canEditNode(state, itemId);
+      });
+      if (anyUnmodifiable)
+        return;
+
       // If we are dragging a single link, we can do the *Link* effect.
       // Otherwise, we only allow copy and move.
       if (e.dataTransfer) {
@@ -475,7 +482,6 @@ cr.define('bookmarks', function() {
       if (!overElement)
         return;
 
-
       // Now we know that we can drop. Determine if we will drop above, on or
       // below based on mouse position etc.
       this.dropDestination_ =
@@ -547,6 +553,9 @@ cr.define('bookmarks', function() {
       if (isBookmarkList(overElement))
         itemId = state.selectedFolder;
 
+      if (!bookmarks.util.canReorderChildren(state, itemId))
+        return DropPosition.NONE;
+
       // Drags of a bookmark onto itself or of a folder into its children aren't
       // allowed.
       if (dragInfo.isDraggingBookmark(itemId) ||