Add an about:flag to support alternative data saver features

chrome/browser/about_flags.cc

Index: chrome/browser/about_flags.cc
diff --git a/chrome/browser/about_flags.cc b/chrome/browser/about_flags.cc
index 19a4740c5957634ca099e9a71223a39f073889dc..58aae81b06f8aa60d1232f8db1ff2eec7c6f8cab 100644
--- a/chrome/browser/about_flags.cc
+++ b/chrome/browser/about_flags.cc
@@ -253,6 +253,12 @@ const FeatureEntry::Choice kDataReductionProxyLoFiChoices[] = {
      data_reduction_proxy::switches::
          kDataReductionProxyLoFiValueSlowConnectionsOnly}};
 
+const FeatureEntry::Choice kDataReductionProxyServerExperiment[] = {
+    {flags_ui::kGenericExperimentChoiceDefault, "", ""},
+    {flag_descriptions::kDataReductionProxyServerAlternative,
+     data_reduction_proxy::switches::kDataReductionProxyExperiment,
+     data_reduction_proxy::switches::kDataReductionProxyServerAlternative}};
+
 const FeatureEntry::Choice kShowSavedCopyChoices[] = {
     {flags_ui::kGenericExperimentChoiceDefault, "", ""},
     {flag_descriptions::kEnableShowSavedCopyPrimary,
@@ -1892,6 +1898,10 @@ const FeatureEntry kFeatureEntries[] = {
      flag_descriptions::kEnableDataReductionProxyLitePageDescription, kOsAll,
      SINGLE_VALUE_TYPE(
          data_reduction_proxy::switches::kEnableDataReductionProxyLitePage)},
+    {"enable-data-reduction-proxy-server-experiment",
+     flag_descriptions::kEnableDataReductionProxyServerExperimentName,
+     flag_descriptions::kEnableDataReductionProxyServerExperimentDescription,
+     kOsAll, MULTI_VALUE_TYPE(kDataReductionProxyServerExperiment)},
 #if defined(OS_ANDROID)
     {"enable-data-reduction-proxy-savings-promo",
      flag_descriptions::kEnableDataReductionProxySavingsPromoName,