Add rappor::SampleString for consisntecy with domain+registry case

components/rappor/rappor_utils.cc

Index: components/rappor/rappor_utils.cc
diff --git a/components/rappor/rappor_utils.cc b/components/rappor/rappor_utils.cc
index 311c75da66c0623bfefda5f696f3f566f2c1d786..9b253c2fa5fa376b0c46099b6599ed6138a1e344 100644
--- a/components/rappor/rappor_utils.cc
+++ b/components/rappor/rappor_utils.cc
@@ -11,6 +11,15 @@
 
 namespace rappor {
 
+void SampleString(RapporService* rappor_service,
+                  const std::string& metric,
+                  RapporType type,
+                  const std::string& sample) {
+  if (!rappor_service)
+    return;
+  rappor_service->RecordSample(metric, type, sample);
+}
+
 std::string GetDomainAndRegistrySampleFromGURL(const GURL& gurl) {
   if (gurl.SchemeIsHTTPOrHTTPS()) {
     if (net::IsLocalhost(gurl.host()))