Add UMA stats for tracking bookmark depth

chrome/browser/extensions/api/bookmark_manager_private/bookmark_manager_private_api.cc

 // Copyright (c) 2012 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.
 
 #include "chrome/browser/extensions/api/bookmark_manager_private/bookmark_manager_private_api.h"
 
 #include <vector>
 
 #include "base/json/json_writer.h"
 #include "base/prefs/pref_service.h"
@@ skipping 503 matching lines @@
 }
 
 bool BookmarkManagerPrivateCanEditFunction::RunImpl() {
   PrefService* prefs = user_prefs::UserPrefs::Get(profile_);
   SetResult(new base::FundamentalValue(
       prefs->GetBoolean(prefs::kEditBookmarksEnabled)));
   return true;
 }
 
 bool BookmarkManagerPrivateRecordLaunchFunction::RunImpl() {
-  RecordBookmarkLaunch(BOOKMARK_LAUNCH_LOCATION_MANAGER);
+  RecordBookmarkLaunch(NULL, BOOKMARK_LAUNCH_LOCATION_MANAGER);
   return true;
 }
 
 bool BookmarkManagerPrivateCanOpenNewWindowsFunction::RunImpl() {
   bool can_open_new_windows = true;
 
 #if defined(OS_WIN)
   if (win8::IsSingleWindowMetroMode())
     can_open_new_windows = false;
 #endif  // OS_WIN
@@ skipping 14 matching lines @@
       return false;
     }
     if (!bookmark_api_helpers::RemoveNode(model, id, true, &error_))
       return false;
   }
 
   return true;
 }
 
 }  // namespace extensions