Keyboard Lock Host implementation

components/keyboard_lock/platform_key_hook_null.cc

Index: components/keyboard_lock/platform_key_hook_null.cc
diff --git a/components/keyboard_lock/platform_key_hook_null.cc b/components/keyboard_lock/platform_key_hook_null.cc
new file mode 100644
index 0000000000000000000000000000000000000000..95895728ed96da0dbaac0d21ad01497fdcb4c62b
--- /dev/null
+++ b/components/keyboard_lock/platform_key_hook_null.cc
@@ -0,0 +1,24 @@
+// 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_hook.h"
+
+namespace keyboard_lock {
+
+PlatformKeyHook::PlatformKeyHook(Browser* owner, KeyEventFilter* filter)
+    : owner_(owner),
+      filter_(filter) {}
+
+PlatformKeyHook::~PlatformKeyHook() = default;
+
+bool PlatformKeyHook::RegisterKey(const std::vector<ui::KeyboardCode>& codes) {
+  return false;
+}
+
+bool PlatformKeyHook::UnregisterKey(
+    const std::vector<ui::KeyboardCode>& codes) {
+  return false;
+}
+
+}  // namespace keyboard_lock