Add UMA stats for tracking bookmark depth

chrome/browser/ui/cocoa/bookmarks/bookmark_bar_controller.mm

 // 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.
 
 #import "chrome/browser/ui/cocoa/bookmarks/bookmark_bar_controller.h"
 
 #include "base/mac/bundle_locations.h"
 #include "base/mac/mac_util.h"
 #include "base/metrics/histogram.h"
 #include "base/prefs/pref_service.h"
@@ skipping 655 matching lines @@
   DCHECK([sender respondsToSelector:@selector(bookmarkNode)]);
   const BookmarkNode* node = [sender bookmarkNode];
   DCHECK(node);
   WindowOpenDisposition disposition =
       ui::WindowOpenDispositionFromNSEvent([NSApp currentEvent]);
   RecordAppLaunch(browser_->profile(), node->url());
   [self openURL:node->url() disposition:disposition];
 
   if (!animate)
     [self closeFolderAndStopTrackingMenus];
-  RecordBookmarkLaunch([self bookmarkLaunchLocation]);
+  RecordBookmarkLaunch(node, [self bookmarkLaunchLocation]);
 }
 
 // Common function to open a bookmark folder of any type.
 - (void)openBookmarkFolder:(id)sender {
   DCHECK([sender isKindOfClass:[BookmarkButton class]]);
   DCHECK([[sender cell] isKindOfClass:[BookmarkButtonCell class]]);
 
   // Only record the action if it's the initial folder being opened.
   if (!showFolderMenus_)
     RecordBookmarkFolderOpen([self bookmarkLaunchLocation]);
@@ skipping 1986 matching lines @@
 - (id<BookmarkButtonControllerProtocol>)controllerForNode:
     (const BookmarkNode*)node {
   // See if it's in the bar, then if it is in the hierarchy of visible
   // folder menus.
   if (bookmarkModel_->bookmark_bar_node() == node)
     return self;
   return [folderController_ controllerForNode:node];
 }
 
 @end