Adding UMA metric to record the type of suggestion displayed on the NTP's Most Visited section.

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 54 matching lines @@
   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_fallback_thumbnails_requested_;
 
   // 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_fallback_thumbnails_used_;
 
+  // True if at least one iframe came from a server-side suggestion. In
+  // practice, either all the iframes are server-side suggestions or none are.
+  bool server_side_suggestions_;
+
   // 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_