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

chrome/browser/permissions/permission_context_base.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 CHROME_BROWSER_PERMISSIONS_PERMISSION_CONTEXT_BASE_H_
 #define CHROME_BROWSER_PERMISSIONS_PERMISSION_CONTEXT_BASE_H_
 
 #include <memory>
 
-#include "base/callback.h"
+#include "base/callback_forward.h"
 #include "base/containers/scoped_ptr_hash_map.h"
-#include "base/memory/ref_counted.h"
 #include "base/memory/weak_ptr.h"
 #include "build/build_config.h"
 #include "chrome/browser/permissions/permission_request.h"
 #include "components/content_settings/core/common/content_settings.h"
 #include "components/content_settings/core/common/content_settings_types.h"
 #include "components/keyed_service/core/keyed_service.h"
 #include "content/public/browser/permission_type.h"
-#include "url/gurl.h"
 
 #if defined(OS_ANDROID)
 class PermissionQueueController;
 #endif
+class GURL;
+class PermissionDecisionAutoBlocker;
 class PermissionRequestID;
 class Profile;
 
 namespace content {
 class WebContents;
 }
 
 using BrowserPermissionCallback = base::Callback<void(ContentSetting)>;
 
 // This base class contains common operations for granting permissions.
@@ skipping 115 matching lines @@
 
   // Whether the permission should be restricted to secure origins.
   virtual bool IsRestrictedToSecureOrigins() const = 0;
 
   content::PermissionType permission_type() const { return permission_type_; }
   ContentSettingsType content_settings_type() const {
     return content_settings_type_;
   }
 
  private:
+  friend class PermissionContextBaseTests;
+
   // Called when a request is no longer used so it can be cleaned up.
   void CleanUpRequest(const PermissionRequestID& id);
 
   Profile* profile_;
+  std::unique_ptr<PermissionDecisionAutoBlocker> decision_auto_blocker_;
   const content::PermissionType permission_type_;
   const ContentSettingsType content_settings_type_;
 #if defined(OS_ANDROID)
   std::unique_ptr<PermissionQueueController> permission_queue_controller_;
 #endif
   base::ScopedPtrHashMap<std::string, std::unique_ptr<PermissionRequest>>
       pending_requests_;
 
   // Must be the last member, to ensure that it will be
   // destroyed first, which will invalidate weak pointers
   base::WeakPtrFactory<PermissionContextBase> weak_factory_;
 };
 
 #endif  // CHROME_BROWSER_PERMISSIONS_PERMISSION_CONTEXT_BASE_H_