Added data reduction proxy holdback experiment

components/data_reduction_proxy/browser/data_reduction_proxy_settings_test_utils.h

Index: components/data_reduction_proxy/browser/data_reduction_proxy_settings_test_utils.h
diff --git a/components/data_reduction_proxy/browser/data_reduction_proxy_settings_test_utils.h b/components/data_reduction_proxy/browser/data_reduction_proxy_settings_test_utils.h
index 1fb3301c70660f340621e661ee67dd1bb1d8fb6f..b7554ae66733de8abad27e81bacb3ef5126ee3e1 100644
--- a/components/data_reduction_proxy/browser/data_reduction_proxy_settings_test_utils.h
+++ b/components/data_reduction_proxy/browser/data_reduction_proxy_settings_test_utils.h
@@ -105,11 +105,13 @@ class DataReductionProxySettingsTestBase : public testing::Test {
   template <class C> void ResetSettings(bool allowed,
                                         bool fallback_allowed,
                                         bool alt_allowed,
-                                        bool promo_allowed);
+                                        bool promo_allowed,
+                                        bool holdback);
   virtual void ResetSettings(bool allowed,
                              bool fallback_allowed,
                              bool alt_allowed,
-                             bool promo_allowed) = 0;
+                             bool promo_allowed,
+                             bool holdback) = 0;
 
   template <class C> void SetProbeResult(
       const std::string& test_url,
@@ -162,9 +164,10 @@ class ConcreteDataReductionProxySettingsTest
   virtual void ResetSettings(bool allowed,
                              bool fallback_allowed,
                              bool alt_allowed,
-                             bool promo_allowed) OVERRIDE {
+                             bool promo_allowed,
+                             bool holdback) OVERRIDE {
     return DataReductionProxySettingsTestBase::ResetSettings<C>(
-        allowed, fallback_allowed, alt_allowed, promo_allowed);
+        allowed, fallback_allowed, alt_allowed, promo_allowed, holdback);
   }
 
   virtual void SetProbeResult(const std::string& test_url,