Implement a policy to autologin a public account.

chrome/browser/policy/device_policy_decoder_chromeos.cc

Index: chrome/browser/policy/device_policy_decoder_chromeos.cc
diff --git a/chrome/browser/policy/device_policy_decoder_chromeos.cc b/chrome/browser/policy/device_policy_decoder_chromeos.cc
index 53d3d95b09739b222ab740bd907c680407427e8f..3877642c61b681c9aea9c1e9baf6edcc312426db 100644
--- a/chrome/browser/policy/device_policy_decoder_chromeos.cc
+++ b/chrome/browser/policy/device_policy_decoder_chromeos.cc
@@ -132,6 +132,23 @@ void DecodeLoginPolicies(const em::ChromeDeviceSettingsProto& policy,
                     account_list);
     }
   }
+
+  if (policy.has_device_local_account_auto_login()) {
+    const em::DeviceLocalAccountAutoLoginProto& container(
+        policy.device_local_account_auto_login());
+    if (container.has_id()) {
+      policies->Set(key::kDeviceLocalAccountAutoLoginId,
+                    POLICY_LEVEL_MANDATORY,
+                    POLICY_SCOPE_MACHINE,
+                    Value::CreateStringValue(container.id()));
+    }
+    if (container.has_delay()) {
+      policies->Set(key::kDeviceLocalAccountAutoLoginDelay,
+                    POLICY_LEVEL_MANDATORY,
+                    POLICY_SCOPE_MACHINE,
+                    DecodeIntegerValue(container.delay()));
+    }
+  }
 }
 
 void DecodeKioskPolicies(const em::ChromeDeviceSettingsProto& policy,