Add attempt count metric to FaviconHandler

components/favicon/core/favicon_handler.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 COMPONENTS_FAVICON_CORE_FAVICON_HANDLER_H_
 #define COMPONENTS_FAVICON_CORE_FAVICON_HANDLER_H_
 
 #include <stddef.h>
 
 #include <vector>
@@ skipping 272 matching lines @@
   GURL notification_icon_url_;
   favicon_base::IconType notification_icon_type_;
 
   // The FaviconService which implements favicon operations. May be null during
   // testing.
   FaviconService* service_;
 
   // This handler's delegate.
   Delegate* delegate_;
 
+  // Captures the number of download requests that were initiated for the
+  // current url_.
+  int num_download_requests_;
+
   // The index of the favicon URL in |image_urls_| which is currently being
   // requested from history or downloaded.
   size_t current_candidate_index_;
 
   // Best image we've seen so far.  As images are downloaded from the page they
   // are stored here. When a satisfying icon is found (as defined in
   // UpdateFaviconCandidate()), the favicon service and the delegate are
   // notified.
   DownloadedFavicon best_favicon_;
 
   DISALLOW_COPY_AND_ASSIGN(FaviconHandler);
 };
 
 }  // namespace favicon
 
 #endif  // COMPONENTS_FAVICON_CORE_FAVICON_HANDLER_H_