Keyboard Lock Host implementation

components/keyboard_lock/widget_key_event_filter.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_WIDGET_KEY_EVENT_FILTER_H_
+#define COMPONENTS_KEYBOARD_LOCK_WIDGET_KEY_EVENT_FILTER_H_
+
+#include "components/keyboard_lock/key_event_filter.h"
+
+namespace content {
+class WebContents;
+class RenderWidgetHost;
+}  // namespace
+
+namespace keyboard_lock {
+
+// An implementation of KeyEventFilter to forward key events to the
+// RenderWidgetHost.
+class WidgetKeyEventFilter : public KeyEventFilter {
+ public:
+  explicit WidgetKeyEventFilter(const content::WebContents* contents);
+  ~WidgetKeyEventFilter() override;
+
+ private:
+  // KeyEventFilter implementations
+  bool OnKeyDown(ui::KeyboardCode code, int flags) override;
+  bool OnKeyUp(ui::KeyboardCode code, int flags) override;
+
+  content::RenderWidgetHost* const host_;
+};
+
+}  // namespace keyboard_lock
+
+#endif  // COMPONENTS_KEYBOARD_LOCK_WIDGET_KEY_EVENT_FILTER_H_