Keyboard Lock Host implementation

components/keyboard_lock/key_hook_activator_thread_proxy.h

+// 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.
+
+#ifndef COMPONENTS_KEYBOARD_LOCK_KEY_HOOK_ACTIVITOR_THREAD_PROXY_H_
+#define COMPONENTS_KEYBOARD_LOCK_KEY_HOOK_ACTIVITOR_THREAD_PROXY_H_
+
+#include "base/memory/ref_counted.h"
+#include "base/single_thread_task_runner.h"
+#include "components/keyboard_lock/key_hook_activator.h"
+
+namespace keyboard_lock {
+
+// An implementation of KeyHookActivator to forward requests to |runner|.
+class KeyHookActivatorThreadProxy final : public KeyHookActivator {
+ public:
+  // |key_hook| should never be destroyed.
+  KeyHookActivatorThreadProxy(
+      KeyHookActivator* const key_hook,
+      scoped_refptr<base::SingleThreadTaskRunner> runner);
+  ~KeyHookActivatorThreadProxy() override;
+
+  // KeyHookActivator implementations.
+  void RegisterKey(const std::vector<ui::KeyboardCode>& codes,
+                   base::Callback<void(bool)> on_result) override;
+  void UnregisterKey(const std::vector<ui::KeyboardCode>& codes,
+                     base::Callback<void(bool)> on_result) override;
+  void Activate(base::Callback<void(bool)> on_result) override;
+  void Deactivate(base::Callback<void(bool)> on_result) override;
+
+ private:
+  KeyHookActivator* const key_hook_;
+  const scoped_refptr<base::SingleThreadTaskRunner> runner_;
+};
+
+}  // namespace keyboard_lock
+
+#endif  // COMPONENTS_KEYBOARD_LOCK_KEY_HOOK_ACTIVITOR_THREAD_PROXY_H_