Ensure the 1993 NTP logs to UMA Most Visited tiles that use the fallback thumbnail instead of the p…

chrome/browser/ui/webui/ntp/ntp_user_data_logger.h

 // Copyright 2013 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_UI_WEBUI_NTP_NTP_USER_DATA_LOGGER_H_
 #define CHROME_BROWSER_UI_WEBUI_NTP_NTP_USER_DATA_LOGGER_H_
 
 #include "chrome/common/ntp_logging_events.h"
 #include "content/public/browser/web_contents_observer.h"
 #include "content/public/browser/web_contents_user_data.h"
@@ skipping 46 matching lines @@
 
   // Total number of attempts made to load thumbnail images for this NTP
   // session.
   size_t number_of_thumbnail_attempts_;
 
   // Total number of errors that occurred when trying to load thumbnail images
   // for this NTP session. When these errors occur a grey tile is shown instead
   // of a thumbnail image.
   size_t number_of_thumbnail_errors_;
 
+  // Total number of attempts made to load thumbnail images while providing a
+  // fallback thumbnail for this NTP session.
+  size_t number_of_thumbnail_with_fallback_attempts_;

[Mathieu, 2013/09/03 21:40:23]

nit: number_of_fallback_thumbnails_requested_?

[beaudoin, 2013/09/03 22:34:55]

Done.

+
+  // Total number of errors that occurred while trying to load the primary
+  // thumbnail image and that caused a fallback to the secondary thumbnail.
+  size_t number_of_thumbnail_fallbacks_;

[Mathieu, 2013/09/03 21:40:23]

nit: number_of_fallback_thumbnails_used_?

[beaudoin, 2013/09/03 22:34:55]

Done.

+
   // The URL of this New Tab Page - varies based on NTP version.
   GURL ntp_url_;
 
   DISALLOW_COPY_AND_ASSIGN(NTPUserDataLogger);
 };
 
 #endif  // CHROME_BROWSER_UI_WEBUI_NTP_NTP_USER_DATA_LOGGER_H_