[MD Bookmarks] Refine mouse selection

chrome/browser/resources/md_bookmarks/dnd_manager.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.
 
 cr.define('bookmarks', function() {
   /**
    * @param {BookmarkElement} element
    * @return {boolean}
    */
   function isBookmarkItem(element) {
@@ skipping 397 matching lines @@
       // Determine the selected bookmarks.
       var state = store.data;
       var draggedNodes = Array.from(state.selection.items);
 
       // Change selection to the dragged node if the node is not part of the
       // existing selection.
       if (isBookmarkFolderNode(dragElement) ||
           draggedNodes.indexOf(dragId) == -1) {
         store.dispatch(bookmarks.actions.deselectItems());
         if (!isBookmarkFolderNode(dragElement)) {
-          store.dispatch(
-              bookmarks.actions.selectItem(dragId, true, false, state));
+          store.dispatch(bookmarks.actions.selectItem(dragId, state, {
+            clear: false,
+            range: false,
+            toggle: false,
+          }));
         }
         draggedNodes = [dragId];
       }
 
       e.preventDefault();
 
       // If we are dragging a single link, we can do the *Link* effect.
       // Otherwise, we only allow copy and move.
       if (e.dataTransfer) {
         e.dataTransfer.effectAllowed =
@@ skipping 201 matching lines @@
       this.dropIndicator_.setTimeout = this.setTimeout_;
     }
   };
 
   return {
     DNDManager: DNDManager,
     DragInfo: DragInfo,
     DropIndicator: DropIndicator,
   };
 });