diff --git a/client_library/client_binder.cc b/client_library/client_binder.cc
index 54b33ed..5c22f84 100644
--- a/client_library/client_binder.cc
+++ b/client_library/client_binder.cc
@@ -58,6 +58,11 @@
       .isOk();
 }
 
+bool BinderUpdateEngineClient::AttemptInstall(
+    const string& omaha_url, const std::vector<string>& dlc_module_ids) {
+  return false;
+}
+
 bool BinderUpdateEngineClient::GetStatus(int64_t* out_last_checked_time,
                                          double* out_progress,
                                          UpdateStatus* out_update_status,
diff --git a/client_library/client_binder.h b/client_library/client_binder.h
index 17f2beb..b3c8940 100644
--- a/client_library/client_binder.h
+++ b/client_library/client_binder.h
@@ -47,6 +47,9 @@
                      const std::string& omaha_url,
                      bool at_user_request) override;
 
+  bool AttemptInstall(const std::string& omaha_url,
+                      const std::vector<std::string>& dlc_module_ids) override;
+
   bool GetStatus(int64_t* out_last_checked_time,
                  double* out_progress,
                  UpdateStatus* out_update_status,
diff --git a/client_library/client_dbus.cc b/client_library/client_dbus.cc
index 1072836..e0d1f64 100644
--- a/client_library/client_dbus.cc
+++ b/client_library/client_dbus.cc
@@ -20,6 +20,7 @@
 
 #include <dbus/bus.h>
 #include <update_engine/dbus-constants.h>
+#include <update_engine/proto_bindings/update_engine.pb.h>
 
 #include "update_engine/update_status_utils.h"
 
@@ -27,6 +28,7 @@
 using dbus::Bus;
 using org::chromium::UpdateEngineInterfaceProxy;
 using std::string;
+using std::vector;
 
 namespace update_engine {
 namespace internal {
@@ -55,6 +57,24 @@
       nullptr);
 }
 
+bool DBusUpdateEngineClient::AttemptInstall(
+    const string& omaha_url, const vector<string>& dlc_module_ids) {
+  // Convert parameters into protobuf.
+  chromeos_update_engine::DlcParameters dlc_parameters;
+  dlc_parameters.set_omaha_url(omaha_url);
+  for (const auto& dlc_module_id : dlc_module_ids) {
+    chromeos_update_engine::DlcInfo* dlc_info = dlc_parameters.add_dlc_infos();
+    dlc_info->set_dlc_id(dlc_module_id);
+  }
+  string dlc_request;
+  if (dlc_parameters.SerializeToString(&dlc_request)) {
+    return proxy_->AttemptInstall(dlc_request, nullptr /* brillo::ErrorPtr* */);
+  } else {
+    LOG(ERROR) << "Fail to serialize a protobuf to a string.";
+    return false;
+  }
+}
+
 bool DBusUpdateEngineClient::GetStatus(int64_t* out_last_checked_time,
                                        double* out_progress,
                                        UpdateStatus* out_update_status,
diff --git a/client_library/client_dbus.h b/client_library/client_dbus.h
index cec1665..a186d45 100644
--- a/client_library/client_dbus.h
+++ b/client_library/client_dbus.h
@@ -41,6 +41,9 @@
                      const std::string& omaha_url,
                      bool at_user_request) override;
 
+  bool AttemptInstall(const std::string& omaha_url,
+                      const std::vector<std::string>& dlc_module_ids) override;
+
   bool GetStatus(int64_t* out_last_checked_time,
                  double* out_progress,
                  UpdateStatus* out_update_status,
diff --git a/client_library/include/update_engine/client.h b/client_library/include/update_engine/client.h
index be87c76..1bc6111 100644
--- a/client_library/include/update_engine/client.h
+++ b/client_library/include/update_engine/client.h
@@ -20,6 +20,7 @@
 #include <cstdint>
 #include <memory>
 #include <string>
+#include <vector>
 
 #include "update_engine/status_update_handler.h"
 #include "update_engine/update_status.h"
@@ -47,6 +48,18 @@
                              const std::string& omaha_url,
                              bool at_user_request) = 0;
 
+  // Request the update_engine to install a list of DLC modules.
+  // |omaha_url|
+  //     Force update_engine to look for updates from the given server. Passing
+  //     empty indicates update_engine should use its default value. Note that
+  //     update_engine will ignore this parameter in production mode to avoid
+  //     pulling untrusted updates.
+  // |dlc_module_ids|
+  //     A list of DLC module IDs.
+  virtual bool AttemptInstall(
+      const std::string& omaha_url,
+      const std::vector<std::string>& dlc_module_ids) = 0;
+
   // Returns the current status of the Update Engine.
   //
   // |out_last_checked_time|