Add a feature which, when enabled, blocks permissions after X prompt dismissals.

chrome/browser/permissions/permission_util.h

 // Copyright 2015 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_UTIL_H_
 #define CHROME_BROWSER_PERMISSIONS_PERMISSION_UTIL_H_
 
 #include <string>
 
+#include "base/feature_list.h"
 #include "base/macros.h"
+#include "chrome/common/chrome_features.h"
 #include "components/content_settings/core/common/content_settings.h"
 #include "components/content_settings/core/common/content_settings_types.h"
 #include "url/gurl.h"
 
 class Profile;
 
 namespace content {
 enum class PermissionType;
 }  // namespace content
 
@@ skipping 39 matching lines @@
 
    private:
     Profile* profile_;
     const GURL primary_url_;
     const GURL secondary_url_;
     ContentSettingsType content_type_;
     PermissionSourceUI source_ui_;
     bool is_initially_allowed_;
   };
 
+  static bool ShouldChangeDismissalToBlock(Profile* profile,
+                                           const GURL& url,
+                                           content::PermissionType permission);
+
  private:
   DISALLOW_IMPLICIT_CONSTRUCTORS(PermissionUtil);
 };
 
 #endif  // CHROME_BROWSER_PERMISSIONS_PERMISSION_UTIL_H_