Log the number of new icons created per jumplist update

chrome/browser/win/jumplist.h

 // 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.
 
 #ifndef CHROME_BROWSER_WIN_JUMPLIST_H_
 #define CHROME_BROWSER_WIN_JUMPLIST_H_
 
 #include <stddef.h>
 
 #include <list>
@@ skipping 171 matching lines @@
   // after requests storms have subsided.
   void DeferredTabRestoreServiceChanged();
 
   // Deletes icon files of |category| in |icon_dir| which are not in the cache
   // anymore.
   void DeleteIconFiles(const base::FilePath& icon_dir,
                        JumpListCategory category);
 
   // Creates at most |max_items| icon files of |category| in |icon_dir| for the
   // asynchrounously loaded icons stored in |item_list|.
-  void CreateIconFiles(const base::FilePath& icon_dir,
-                       const ShellLinkItemList& item_list,
-                       size_t max_items,
-                       JumpListCategory category);
+  // Returns the number of new icon files created.
+  int CreateIconFiles(const base::FilePath& icon_dir,
+                      const ShellLinkItemList& item_list,
+                      size_t max_items,
+                      JumpListCategory category);
 
   // Updates icon files in |icon_dir|, which includes deleting old icons and
   // creating at most |slot_limit| new icons for |page_list|.
-  void UpdateIconFiles(const base::FilePath& icon_dir,
-                       const ShellLinkItemList& page_list,
-                       size_t slot_limit,
-                       JumpListCategory category);
+  // Returns the number of new icon files created.
+  int UpdateIconFiles(const base::FilePath& icon_dir,
+                      const ShellLinkItemList& page_list,
+                      size_t slot_limit,
+                      JumpListCategory category);
 
   // Updates the jumplist, once all the data has been fetched. This method calls
   // UpdateJumpList() to do most of the work.
   void RunUpdateJumpList(
       IncognitoModePrefs::Availability incognito_availability,
       const base::string16& app_id,
       const base::FilePath& profile_dir,
       base::RefCountedData<JumpListData>* ref_counted_data);
 
   // Updates the application JumpList, which consists of 1) delete old icon
@@ skipping 57 matching lines @@
   // JumpListIconsOld directory.
   scoped_refptr<base::SequencedTaskRunner> delete_jumplisticons_task_runner_;
 
   // For callbacks may be run after destruction.
   base::WeakPtrFactory<JumpList> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(JumpList);
 };
 
 #endif  // CHROME_BROWSER_WIN_JUMPLIST_H_