Fix policy test server key rotation feature

chrome/browser/policy/test/local_policy_test_server.cc

Index: chrome/browser/policy/test/local_policy_test_server.cc
diff --git a/chrome/browser/policy/test/local_policy_test_server.cc b/chrome/browser/policy/test/local_policy_test_server.cc
index f336af1d07e37b7373272052e2a1f4d9a210fe9f..476e037c4a158078577522a462fc83e15b78e432 100644
--- a/chrome/browser/policy/test/local_policy_test_server.cc
+++ b/chrome/browser/policy/test/local_policy_test_server.cc
@@ -15,6 +15,7 @@
 #include "base/json/json_writer.h"
 #include "base/path_service.h"
 #include "base/strings/stringprintf.h"
+#include "base/values.h"
 #include "build/build_config.h"
 #include "components/policy/core/common/cloud/cloud_policy_constants.h"
 #include "crypto/rsa_private_key.h"
@@ -114,6 +115,10 @@ bool LocalPolicyTestServer::SetSigningKeyAndSignature(
   return bytes_written == static_cast<int>(signature.size());
 }
 
+void LocalPolicyTestServer::SetSigningKeysAutomaticRotation() {
+  signing_keys_automatic_rotation_ = true;
+}
+
 void LocalPolicyTestServer::RegisterClient(const std::string& dm_token,
                                            const std::string& device_id) {
   CHECK(server_data_dir_.IsValid());
@@ -237,6 +242,10 @@ bool LocalPolicyTestServer::GenerateAdditionalArguments(
   arguments->SetString("config-file", config_file_.AsUTF8Unsafe());
   if (!policy_key_.empty())
     arguments->SetString("policy-key", policy_key_.AsUTF8Unsafe());
+  if (signing_keys_automatic_rotation_) {
+    arguments->Set("rotate-policy-keys-automatically",
+                   base::Value::CreateNullValue());
+  }
   if (server_data_dir_.IsValid()) {
     arguments->SetString("data-dir", server_data_dir_.GetPath().AsUTF8Unsafe());