Stub implementation of Permissions API module.

Source/modules/permissions/Permissions.idl

Index: Source/modules/permissions/Permissions.idl
diff --git a/Source/modules/permissions/Permissions.idl b/Source/modules/permissions/Permissions.idl
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+// Copyright 2014 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.
+
+// Specification at:
+// https://w3c.github.io/permissions/
+
+enum PermissionName {
+    "geolocation",
+    "notifications",
+    "push"
+};
+
+[
+    Exposed=(Window,Worker),
+    GarbageCollected,
+    RuntimeEnabled=Permissions
+] interface Permissions {
+    [CallWith=ScriptState] static Promise<PermissionStatus> query(PermissionName permission);
+};