Add more Rappor metrics

chrome/browser/search_engines/template_url_service.cc

Index: chrome/browser/search_engines/template_url_service.cc
diff --git a/chrome/browser/search_engines/template_url_service.cc b/chrome/browser/search_engines/template_url_service.cc
index aba90a040f65ea7347153f76f70773f690c77c7d..7052857f205d43f694f4a16a89d328c2bd9609b7 100644
--- a/chrome/browser/search_engines/template_url_service.cc
+++ b/chrome/browser/search_engines/template_url_service.cc
@@ -29,6 +29,7 @@
 #include "chrome/browser/history/history_service.h"
 #include "chrome/browser/history/history_service_factory.h"
 #include "chrome/browser/profiles/profile.h"
+#include "chrome/browser/rappor/sampling.h"
 #include "chrome/browser/rlz/rlz.h"
 #include "chrome/browser/search_engines/search_host_to_urls_map.h"
 #include "chrome/browser/search_engines/search_terms_data.h"
@@ -969,6 +970,9 @@ void TemplateURLService::OnWebDataServiceRequestDone(
     UMA_HISTOGRAM_ENUMERATION("Search.DefaultSearchProviderType",
         TemplateURLPrepopulateData::GetEngineType(*default_search_provider_),
         SEARCH_ENGINE_MAX);
+    rappor::SampleDomainAndRegistryFromHost(
+        "Search.DefaultSearchProvider",
+        default_search_provider_->url_ref().GetHost());
   }
 }