Re-enable rappor for vrshell

components/rappor/rappor_utils.h

Index: components/rappor/rappor_utils.h
diff --git a/components/rappor/rappor_utils.h b/components/rappor/rappor_utils.h
index 8e425665d8eb7109aa74cdf97c990115705e0152..f8600d6bcf5b46d7e54f572dff6790631d673a11 100644
--- a/components/rappor/rappor_utils.h
+++ b/components/rappor/rappor_utils.h
@@ -33,6 +33,11 @@ void SampleDomainAndRegistryFromGURL(RapporService* rappor_service,
                                      const std::string& metric,
                                      const GURL& gurl);
 
+// Returns NULL if there is no default service.
+RapporService* GetDefaultService();
+
+void SetDefaultServiceAccessor(RapporService* (*getDefaultService)());
+
 }  // namespace rappor
 
 #endif  // COMPONENTS_RAPPOR_RAPPOR_UTILS_H_