[System-Keyboard-Lock] Forward navigator functions to RenderFrameHost

third_party/WebKit/public/platform/modules/keyboard_lock/keyboard_lock.mojom

+// 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.
+
+module blink.mojom;
+
+// The browser side service to process navigator.requestKeyLock() and
+// navigator.cancelKeyLock() web APIs. See http://crbug.com/680809.
+interface KeyboardLockService {
+  // Registers a set of string-formatted key codes
+  // (https://www.w3.org/TR/uievents/#interface-keyboardevent) to the platform
+  // dependent native API, so the web page can receive these key codes
+  // thereafter.
+  // The reason will only be provided if the request is rejected.
+  RequestKeyLock(array<string> key_codes)
+    => (bool allowed_by_user_or_browser, string reason);
+
+  // Removes all reserved keys. This function is expected to never fail, the
+  // callback indicates the finish of the processing only.
+  CancelKeyLock();
+};