mojo api for view based lockscreen

chrome/browser/ui/ash/lock_screen_client.h

+// Copyright 2016 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.
+
+#ifndef CHROME_BROWSER_UI_ASH_LOCK_SCREEN_CLIENT_H_
+#define CHROME_BROWSER_UI_ASH_LOCK_SCREEN_CLIENT_H_
+
+#include "ash/public/interfaces/lock_screen.mojom.h"
+#include "base/macros.h"
+#include "mojo/public/cpp/bindings/binding.h"
+
+// Handles method calls delegated back to chrome from ash. Also notifies ash of
+// relevant state changes in chrome.
+class LockScreenClient : public ash::mojom::LockScreenClient {
+ public:
+  LockScreenClient();
+  ~LockScreenClient() override;
+
+  static LockScreenClient* Get();
+
+  // ash::mojom::LockScreenClient:
+  void AuthenticateUser(const AccountId& account_id,
+                        const std::string& hashed_password,
+                        bool authenticated_by_pin) override;
+
+  // Wrappers around the mojom::SystemTray interface.
+  void ShowErrorMessage(int32_t login_attempts,
+                        const std::string& error_text,
+                        const std::string& help_link_text,
+                        int32_t help_topic_id);
+  void ClearErrors();
+
+ private:
+  // Lock screen mojo service in ash.
+  ash::mojom::LockScreenPtr lock_screen_;
+
+  // Binds this object to the client interface.
+  mojo::Binding<ash::mojom::LockScreenClient> binding_;
+
+  DISALLOW_COPY_AND_ASSIGN(LockScreenClient);
+};
+
+#endif  // CHROME_BROWSER_UI_ASH_LOCK_SCREEN_CLIENT_H_