Add "critical" parameter to DMServer requests.

components/policy/core/common/cloud/device_management_service.cc

Index: components/policy/core/common/cloud/device_management_service.cc
diff --git a/components/policy/core/common/cloud/device_management_service.cc b/components/policy/core/common/cloud/device_management_service.cc
index 665a800c3fea28f8e7011917b8b860dfe260079c..64e6c184b42b91c0b7de4fbf99ff8f1246073f22 100644
--- a/components/policy/core/common/cloud/device_management_service.cc
+++ b/components/policy/core/common/cloud/device_management_service.cc
@@ -472,6 +472,11 @@ void DeviceManagementRequestJob::SetClientID(const std::string& client_id) {
   AddParameter(dm_protocol::kParamDeviceID, client_id);
 }
 
+void DeviceManagementRequestJob::SetCritical(bool critical) {
+  if (critical)
+    AddParameter(dm_protocol::kParamCritical, "true");
+}
+
 em::DeviceManagementRequest* DeviceManagementRequestJob::GetRequest() {
   return &request_;
 }