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..639ba259a52db79a7394f6fa9ba9ff2033d904c8 100644
--- a/components/rappor/rappor_utils.cc
+++ b/components/rappor/rappor_utils.cc
@@ -45,4 +45,15 @@ void SampleDomainAndRegistryFromGURL(RapporService* rappor_service,
       GetDomainAndRegistrySampleFromGURL(gurl));
 }
 
+RapporService* (*g_GetDefaultService)() = nullptr;
+
+RapporService* GetDefaultService() {
+  return (g_GetDefaultService != nullptr) ? g_GetDefaultService() : nullptr;
+}
+
+void SetDefaultServiceAccessor(RapporService* (*getDefaultService)()) {
+  DCHECK(g_GetDefaultService == nullptr);
+  g_GetDefaultService = getDefaultService;
+}
+
 }  // namespace rappor