Re-enable rappor for vrshell

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 89e4576b7ba30837fe5ba8e2d3e947fbfb5efd02..5ee673f1dfe147bf8f04bea697c7ec5c402a964e 100644
--- a/components/rappor/rappor_utils.cc
+++ b/components/rappor/rappor_utils.cc
@@ -45,4 +45,16 @@ void SampleDomainAndRegistryFromGURL(RapporService* rappor_service,
       GetDomainAndRegistrySampleFromGURL(gurl));
 }
 
+void TrySampleDomainAndRegistryWithDefaultService(const std::string& metric,

[ddorwin, 2016/11/28 21:45:42]

Since we don't even check whether there is a default service, could we just have
callers pass GetDefaultService() and eliminate the need for this?

[billorr, 2016/11/28 23:13:03]

Done.

+                                                  const GURL& gurl) {
+  RapporService* defaultService = TryGetDefaultService();
+  SampleDomainAndRegistryFromGURL(defaultService, metric, gurl);
+}
+
+RapporService* TryGetDefaultService() {
+  return (GetDefaultService != nullptr) ? GetDefaultService() : nullptr;
+}
+
+RapporService* (*GetDefaultService)() = nullptr;
+
 }  // namespace rappor