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 ec0a26ef567b0f0cc84466e80de9c5f478619ddc..083cac409582ef658b96a2f211109b407ed48f7d 100644
--- a/chrome/browser/ui/views/bookmarks/bookmark_bar_view.cc
+++ b/chrome/browser/ui/views/bookmarks/bookmark_bar_view.cc
@@ -1180,6 +1180,8 @@ 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"));

[Alexei Svitkine (slow), 2016/11/18 16:52:15]

Are you missing this in histograms.xml?

[calamity, 2016/11/21 00:49:58]

This already exists in actions.xml, but was only implemented on Mac. Adding it
here implements it on other desktop platforms.

[Alexei Svitkine (slow), 2016/11/21 15:47:06]

Ah, I see.

It does not appear to have an owner or description in actions.xml. If it's
interesting to you, please add yourself as owner and provide a description.

(Otherwise, if it's not interesting, then I suggest removing it in the Mac code
rather than adding it in views.)

[calamity, 2016/11/22 03:18:06]

Done.

   return chrome::DropBookmarks(
       browser_->profile(), data, parent_node, index, copy);
 }