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

Index: chrome/browser/ui/webui/ntp/ntp_user_data_logger.h
diff --git a/chrome/browser/ui/webui/ntp/ntp_user_data_logger.h b/chrome/browser/ui/webui/ntp/ntp_user_data_logger.h
index dc1df81ea28f2dd45a4f3b6f26d4e018fce78f3e..4e1171ed7a4a75acc56f7d6bd4bfbe1bf9066851 100644
--- a/chrome/browser/ui/webui/ntp/ntp_user_data_logger.h
+++ b/chrome/browser/ui/webui/ntp/ntp_user_data_logger.h
@@ -29,6 +29,10 @@ class NTPUserDataLogger
   // session to UMA histogram. Called when the user navigates to a URL.
   void EmitThumbnailErrorRate();
 
+  // Logs the type of the suggestions that were shown on this NTP. Called when
+  // the user navigates to a URL.
+  void EmitSuggestionsType();
+
   // Logs total number of mouseovers per NTP session to UMA histogram. Called
   // when an NTP tab is about to be deactivated (be it by switching tabs, losing
   // focus or closing the tab/shutting down Chrome), or when the user navigates
@@ -72,6 +76,10 @@ class NTPUserDataLogger
   // 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_;