Add better Bookmark Manager drag and drop stats.

tools/metrics/actions/actions.xml

 <!--
 Copyright 2014 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.
 -->
 
 <!--
 This file is a comprehensive list of Chrome user actions along with the owner
 and description for each user action.
 
@@ skipping 2348 matching lines @@
 <action name="BookmarkManager_Command_UndoGlobal">
   <owner>Please list the metric's owners. Add more owner tags as needed.</owner>
   <description>Please enter the description of this user action.</description>
 </action>
 
 <action name="BookmarkManager_Command_UndoNone">
   <owner>Please list the metric's owners. Add more owner tags as needed.</owner>
   <description>Please enter the description of this user action.</description>
 </action>
 
-<action name="BookmarkManager_Drop">
+<action name="BookmarkManager_DropToList">
   <owner>calamity@chromium.org</owner>

[tsergeant, 2016/12/02 04:44:19]

I think these should be marked <obsolete> rather than deleted.

[calamity, 2016/12/05 00:12:19]

Done.

   <description>
-    Fired when a user drops a bookmark after a drag in the bookmark manager.
+    Fired when a user drops a bookmark into the bookmark list between other
+    items in the bookmark manager.
   </description>
 </action>
 
+<action name="BookmarkManager_DropToListItem">
+  <owner>calamity@chromium.org</owner>
+  <description>
+    Fired when a user drops a bookmark directly onto a bookmark list item in the
+    bookmark manager.
+  </description>
+</action>
+
+<action name="BookmarkManager_DropToTree">
+  <owner>calamity@chromium.org</owner>
+  <description>
+    Fired when a user drops a bookmark into the bookmark tree between other
+    nodes in the bookmark manager.
+  </description>
+</action>
+
+<action name="BookmarkManager_DropToTreeItem">
+  <owner>calamity@chromium.org</owner>
+  <description>
+    Fired when a user drops a bookmark directly onto a bookmark tree item in the
+    bookmark manager.
+  </description>
+</action>
+
 <action name="BookmarkManager_Export">
   <owner>Please list the metric's owners. Add more owner tags as needed.</owner>
   <description>Please enter the description of this user action.</description>
 </action>
 
 <action name="BookmarkManager_Import">
   <owner>Please list the metric's owners. Add more owner tags as needed.</owner>
   <description>Please enter the description of this user action.</description>
 </action>
 
@@ skipping 25 matching lines @@
 <action name="BookmarkManager_NavigateTo_SubFolder">
   <owner>Please list the metric's owners. Add more owner tags as needed.</owner>
   <description>Please enter the description of this user action.</description>
 </action>
 
 <action name="BookmarkManager_Sort">
   <owner>Please list the metric's owners. Add more owner tags as needed.</owner>
   <description>Please enter the description of this user action.</description>
 </action>
 
-<action name="BookmarkManager_StartDrag">
+<action name="BookmarkManager_StartDragFromList">
   <owner>calamity@chromium.org</owner>
   <description>
-    Fired when a user starts a drag in the bookmark manager.
+    Fired when a user starts a drag to the tree in the bookmark manager.
   </description>
 </action>
 
+<action name="BookmarkManager_StartDragFromTree">
+  <owner>calamity@chromium.org</owner>
+  <description>
+    Fired when a user starts a drag from the tree in the bookmark manager.
+  </description>
+</action>
+
 <action name="BookmarkManager_Sync">
   <owner>Please list the metric's owners. Add more owner tags as needed.</owner>
   <description>Please enter the description of this user action.</description>
 </action>
 
 <action name="BookmarkMenu_clicked">
   <owner>Please list the metric's owners. Add more owner tags as needed.</owner>
   <description>Please enter the description of this user action.</description>
 </action>
 
@@ skipping 13542 matching lines @@
 <action name="webapps.AddShortcut.Manifest">
   <owner>mlamouri@chromium.org</owner>
   <description>
     Shortcut added to the homescreen with a valid Manifest. This action will be
     recorded in addition to AppShortcut, AppShortcutApple and Bookmark actions
     to keep a trend of whether the webapp also add meta tags.
   </description>
 </action>
 
 </actions>