Record metric of geo permission before and after showing the disclosure.

third_party/WebKit/public/platform/modules/permissions/permission_status.mojom

 // 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.
 
 module blink.mojom;
 
+// Do not remove items from, or reorder this enum as it is used in histograms.
+// New items should be added at the end.
 enum PermissionStatus {
   GRANTED,
   DENIED,
   ASK,
   LAST = ASK
 };