mojo api for view based lockscreen

ash/login/lock_screen_controller.cc

Index: ash/login/lock_screen_controller.cc
diff --git a/ash/login/lock_screen_controller.cc b/ash/login/lock_screen_controller.cc
new file mode 100644
index 0000000000000000000000000000000000000000..27cec62ac1bed12e0ad0554fd047c38407342fbb
--- /dev/null
+++ b/ash/login/lock_screen_controller.cc
@@ -0,0 +1,34 @@
+// Copyright 2017 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "ash/login/lock_screen_controller.h"
+
+namespace ash {
+
+LockScreenController::LockScreenController() {}
+
+LockScreenController::~LockScreenController() {}
+
+void LockScreenController::BindRequest(mojom::LockScreenRequest request) {
+  bindings_.AddBinding(this, std::move(request));
+}
+
+void LockScreenController::AuthenticateUser(const AccountId& account_id,
+                                            const std::string& password,
+                                            bool authenticated_by_pin) {
+  if (lock_screen_client_) {
+    lock_screen_client_->AuthenticateUser(account_id, password,
+                                          authenticated_by_pin);
+  }
+}
+
+void LockScreenController::SetClient(mojom::LockScreenClientPtr client) {
+  lock_screen_client_ = std::move(client);
+}
+
+void LockScreenController::ShowSignInError() {
+  NOTIMPLEMENTED();
+}
+
+}  // namespace ash