Log the number of new icons created per jumplist update

chrome/browser/win/jumplist.h

Index: chrome/browser/win/jumplist.h
diff --git a/chrome/browser/win/jumplist.h b/chrome/browser/win/jumplist.h
index 77a19e3025bfda8abd2da1ba794e5191c5a595d6..a0fb0bf7ff55dad1bb963c26a4d114103842241a 100644
--- a/chrome/browser/win/jumplist.h
+++ b/chrome/browser/win/jumplist.h
@@ -189,17 +189,19 @@ class JumpList : public sessions::TabRestoreServiceObserver,
 
   // 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.