Content Settings: Add RevocationObserver to measure when permissions are revoked

chrome/browser/permissions/permission_manager.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_MANAGER_H_
 #define CHROME_BROWSER_PERMISSIONS_PERMISSION_MANAGER_H_
 
 #include "base/callback_forward.h"
 #include "base/id_map.h"
 #include "base/macros.h"
 #include "base/memory/weak_ptr.h"
 #include "components/content_settings/core/browser/content_settings_observer.h"
 #include "components/content_settings/core/common/content_settings.h"
 #include "components/keyed_service/core/keyed_service.h"
 #include "content/public/browser/permission_manager.h"
 
 class Profile;
 
 namespace content {
 enum class PermissionType;
 class WebContents;
 };  // namespace content
 
 class PermissionManager : public KeyedService,
                           public content::PermissionManager,
-                          public content_settings::Observer {
+                          public content_settings::Observer,
+                          public content_settings::RevocationObserver {
  public:
   explicit PermissionManager(Profile* profile);
   ~PermissionManager() override;
 
   // content::PermissionManager implementation.
   int RequestPermission(
       content::PermissionType permission,
       content::RenderFrameHost* render_frame_host,
       const GURL& requesting_origin,
       const base::Callback<void(content::PermissionStatus)>& callback) override;
@@ skipping 42 matching lines @@
   // Not all WebContents are able to display permission requests. If the PBM
   // is required but missing for |web_contents|, don't pass along the request.
   bool IsPermissionBubbleManagerMissing(content::WebContents* web_contents);
 
   // content_settings::Observer implementation.
   void OnContentSettingChanged(const ContentSettingsPattern& primary_pattern,
                                const ContentSettingsPattern& secondary_pattern,
                                ContentSettingsType content_type,
                                std::string resource_identifier) override;
 
+  // content_settings::RevocationObserver implementation.
+  void OnContentSettingRevoked(const GURL& primary_url,
+                               const GURL& secondary_url,
+                               ContentSettingsType content_type,
+                               std::string resource_identifier) override;
+
   Profile* profile_;
   PendingRequestsMap pending_requests_;
   SubscriptionsMap subscriptions_;
 
   base::WeakPtrFactory<PermissionManager> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(PermissionManager);
 };
 
 #endif // CHROME_BROWSER_PERMISSIONS_PERMISSION_MANAGER_H_