Add PermissionDescriptor to the permissions Mojo interface.

third_party/WebKit/Source/modules/permissions/PermissionUtils.h

+// Copyright 2016 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.
+
+#ifndef PermissionUtils_h
+#define PermissionUtils_h
+
+#include "public/platform/modules/permissions/permission.mojom-blink.h"
+
+namespace blink {
+
+class ExecutionContext;
+
+bool connectToPermissionService(ExecutionContext*,
+                                mojom::blink::PermissionServiceRequest);
+
+mojom::blink::PermissionDescriptorPtr createPermissionDescriptor(
+    mojom::blink::PermissionName);
+
+mojom::blink::PermissionDescriptorPtr createMidiPermissionDescriptor(
+    bool sysex);
+
+}  // namespace blink
+
+#endif  // PermissionUtils_h