Blink implementation of PushManager#hasPermission()

public/platform/WebPushPermissionStatus.h

+// 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.
+
+#ifndef WebPushPermissionStatus_h
+#define WebPushPermissionStatus_h
+
+namespace blink {
+
+enum WebPushPermissionStatus {
+    WebPushPermissionStatusGranted = 0,
+    WebPushPermissionStatusDenied,
+    WebPushPermissionStatusDefault,
+
+    // Used for IPC message range checks.
+    WebPushPermissionStatusLast = WebPushPermissionStatusDefault
+};
+
+} // namespace blink
+#endif // WebPushPermissionStatus_h