Keyboard Lock Host implementation

components/keyboard_lock/platform_key_event_filter.cc

Index: components/keyboard_lock/platform_key_event_filter.cc
diff --git a/components/keyboard_lock/platform_key_event_filter.cc b/components/keyboard_lock/platform_key_event_filter.cc
new file mode 100644
index 0000000000000000000000000000000000000000..fe7fe62edb32db8c5a2a3ba5891bfccb8c041012
--- /dev/null
+++ b/components/keyboard_lock/platform_key_event_filter.cc
@@ -0,0 +1,33 @@
+// 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 "components/keyboard_lock/platform_key_event_filter.h"
+
+#include "base/logging.h"
+#include "components/keyboard_lock/key_event_filter.h"
+#include "ui/events/event_utils.h"
+
+namespace keyboard_lock {
+
+PlatformKeyEventFilter::PlatformKeyEventFilter(KeyEventFilter* filter)
+    : filter_(filter) {
+  DCHECK(filter_);
+}
+PlatformKeyEventFilter::~PlatformKeyEventFilter() = default;
+
+bool PlatformKeyEventFilter::OnPlatformEvent(const ui::PlatformEvent& event) {
+  ui::EventType event_type = ui::EventTypeFromNative(event);
+  if (event_type != ui::ET_KEY_PRESSED && event_type != ui::ET_KEY_RELEASED) {
+    return false;
+  }
+
+  ui::KeyboardCode code = ui::KeyboardCodeFromNative(event);
+  int flags = ui::EventFlagsFromNative(event);
+  bool result = (event_type == ui::ET_KEY_PRESSED ?
+                 filter_->OnKeyDown(code, flags) :
+                 filter_->OnKeyUp(code, flags));
+  return result;
+}
+
+}  // namespace keyboard_lock