Connecting UserClassifier to NtpSnippetsFetcher

tools/metrics/histograms/histograms.xml

Index: tools/metrics/histograms/histograms.xml
diff --git a/tools/metrics/histograms/histograms.xml b/tools/metrics/histograms/histograms.xml
index 3faf3a2d2d6ec2eb84f51204d31cf6082f9ce2e0..934ff8f9f0ef22a63433c82ada5b1cdd4882e7c5 100644
--- a/tools/metrics/histograms/histograms.xml
+++ b/tools/metrics/histograms/histograms.xml
@@ -107917,7 +107917,18 @@ value.
 
 <histogram_suffixes name="RequestThrottlerTypes">
   <suffix name="SuggestionFetcher"
-      label="Fetcher for content suggestions on mobile NTP"/>
+      label="Fetcher for content suggestions on mobile NTP">
+    <obsolete>
+      Deprecated in 10/2016.
+    </obsolete>
+  </suffix>
+  <suffix name="SuggestionFetcherRareNTPUsers"
+      label="Fetcher for content suggestions on mobile NTP - rare NTP users"/>
+  <suffix name="SuggestionFetcherActiveNTPUsers"
+      label="Fetcher for content suggestions on mobile NTP - active NTP users"/>
+  <suffix name="SuggestionFetcherActiveSuggestionConsumers"
+      label="Fetcher for content suggestions on mobile NTP - active
+             suggestions consumers"/>
   <suffix name="SuggestionThumbnailFetcher"
       label="Fetcher for article thumbnails on mobile NTP"/>
   <affected-histogram name="NewTabPage.RequestThrottler.PerDay"/>