Keyboard Lock Host implementation

components/keyboard_lock/active_key_event_filter.cc

Index: components/keyboard_lock/active_key_event_filter.cc
diff --git a/components/keyboard_lock/active_key_event_filter.cc b/components/keyboard_lock/active_key_event_filter.cc
new file mode 100644
index 0000000000000000000000000000000000000000..82b240dd5f8640bd2227b93f5ea71f64e12f3ab1
--- /dev/null
+++ b/components/keyboard_lock/active_key_event_filter.cc
@@ -0,0 +1,38 @@
+// 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/active_key_event_filter.h"
+
+#include "base/logging.h"
+#include "components/keyboard_lock/active_key_event_filter_tracker.h"
+
+namespace keyboard_lock {
+
+ActiveKeyEventFilter::ActiveKeyEventFilter(
+    const ActiveKeyEventFilterTracker* tracker)
+    : tracker_(tracker) {
+  DCHECK(tracker_);
+}
+
+ActiveKeyEventFilter::~ActiveKeyEventFilter() = default;
+
+bool ActiveKeyEventFilter::OnKeyDown(ui::KeyboardCode code, int flags) {
+  KeyEventFilter* filter = tracker_->get();
+  if (!filter) {
+    return false;
+  }
+
+  return filter->OnKeyDown(code, flags);
+}
+
+bool ActiveKeyEventFilter::OnKeyUp(ui::KeyboardCode code, int flags) {
+  KeyEventFilter* filter = tracker_->get();
+  if (!filter) {
+    return false;
+  }
+
+  return filter->OnKeyUp(code, flags);
+}
+
+}  // namespace keyboard_lock