Adding SSL Max Version flag to chrome://flags.

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 11c193fd4fa67ee54a091f44d1a49bfddf226f56..8dea7be05ad3ec9915ef6e5c31f068b4fa28eb24 100644
--- a/chrome/browser/about_flags.cc
+++ b/chrome/browser/about_flags.cc
@@ -53,6 +53,7 @@
 #include "components/search/search_switches.h"
 #include "components/security_state/switches.h"
 #include "components/signin/core/common/signin_switches.h"
+#include "components/ssl_config/ssl_config_switches.h"
 #include "components/sync_driver/sync_driver_switches.h"
 #include "components/tracing/common/tracing_switches.h"
 #include "components/translate/core/browser/translate_prefs.h"
@@ -591,6 +592,12 @@ const FeatureEntry::Choice kEnableWebFontsInterventionV2Choices[] = {
      switches::kEnableWebFontsInterventionV2SwitchValueDisabled},
 };
 
+const FeatureEntry::Choice kSSLVersionMaxChoices[] = {
+    {IDS_GENERIC_EXPERIMENT_CHOICE_DEFAULT, "", "" },
+    {IDS_FLAGS_SSL_VERSION_MAX_TLS12, switches::kSSLVersionMax, "tls1.2"},
+    {IDS_FLAGS_SSL_VERSION_MAX_TLS13, switches::kSSLVersionMax, "tls1.3"},
+};
+
 // RECORDING USER METRICS FOR FLAGS:
 // -----------------------------------------------------------------------------
 // The first line of the entry is the internal name. If you'd like to gather
@@ -1797,6 +1804,9 @@ const FeatureEntry kFeatureEntries[] = {
     {"enable-grouped-history", IDS_FLAGS_ENABLE_GROUPED_HISTORY_NAME,
      IDS_FLAGS_ENABLE_GROUPED_HISTORY_DESCRIPTION, kOsDesktop,
      SINGLE_VALUE_TYPE(switches::kHistoryEnableGroupByDomain)},
+    {"ssl-version-max", IDS_FLAGS_SSL_VERSION_MAX_NAME,
+     IDS_FLAGS_SSL_VERSION_MAX_DESCRIPTION, kOsAll,
+     MULTI_VALUE_TYPE(kSSLVersionMaxChoices)},
     {"enable-token-binding", IDS_FLAGS_ENABLE_TOKEN_BINDING_NAME,
      IDS_FLAGS_ENABLE_TOKEN_BINDING_DESCRIPTION, kOsAll,
      FEATURE_VALUE_TYPE(features::kTokenBinding)},