Add bookmark bar/manager actions to track drag and drop.

chrome/browser/ui/views/bookmarks/bookmark_bar_view.cc

Index: chrome/browser/ui/views/bookmarks/bookmark_bar_view.cc
diff --git a/chrome/browser/ui/views/bookmarks/bookmark_bar_view.cc b/chrome/browser/ui/views/bookmarks/bookmark_bar_view.cc
index 361c0a90a5eab2b270127cf475608aa5d6412326..659cf24d630d5bb9650c000ed3693d773bb1bf91 100644
--- a/chrome/browser/ui/views/bookmarks/bookmark_bar_view.cc
+++ b/chrome/browser/ui/views/bookmarks/bookmark_bar_view.cc
@@ -1202,6 +1202,8 @@ int BookmarkBarView::OnPerformDrop(const DropTargetEvent& event) {
   DCHECK(data.is_valid());
   bool copy = drop_info_->location.operation == ui::DragDropTypes::DRAG_COPY;
   drop_info_.reset();
+
+  content::RecordAction(base::UserMetricsAction("BookmarkBar_DragEnd"));
   return chrome::DropBookmarks(
       browser_->profile(), data, parent_node, index, copy);
 }