Implement permissions embargo for prompts which are repeatedly ignored.

chrome/browser/permissions/permission_result.h

 // 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.
 
 #ifndef CHROME_BROWSER_PERMISSIONS_PERMISSION_RESULT_H_
 #define CHROME_BROWSER_PERMISSIONS_PERMISSION_RESULT_H_
 
 #include "components/content_settings/core/common/content_settings.h"
 
-// Identifies the source or reason for a permission status being returned. This
-// enum backs an UMA histogram and must be treated as append-only.
+// Identifies the source or reason for a permission status being returned.
 enum class PermissionStatusSource {
   // The reason for the status is not specified.
   UNSPECIFIED,
 
-  // The status is the result of being blocked due to the user dismissing a
-  // permission prompt multiple times.
-  MULTIPLE_DISMISSALS,
-
   // The status is the result of being blocked because the permission is on the
   // safe browsing blacklist.
   SAFE_BROWSING_BLACKLIST,
 
   // The status is the result of being blocked by the permissions kill switch.
   KILL_SWITCH,
+
+  // The status is the result of being blocked due to the user dismissing a
+  // permission prompt multiple times.
+  MULTIPLE_DISMISSALS,
+
+  // The status is the result of being blocked due to the user ignoring a
+  // permission prompt multiple times.
+  MULTIPLE_IGNORES,
 };
 
 struct PermissionResult {
   PermissionResult(ContentSetting content_setting,
                    PermissionStatusSource source);
   ~PermissionResult();
 
   ContentSetting content_setting;
   PermissionStatusSource source;
 };
 
 #endif  // CHROME_BROWSER_PERMISSIONS_PERMISSION_RESULT_H_