Implement PermissionService::GetNextPermissionChange.

content/browser/permissions/permission_service_impl.h

Index: content/browser/permissions/permission_service_impl.h
diff --git a/content/browser/permissions/permission_service_impl.h b/content/browser/permissions/permission_service_impl.h
index 57f1bfd48b1fa166b0c40c4261c6ec844ab6a4cf..00633d82deb57f1a097811a5e52feed701ea2ec4 100644
--- a/content/browser/permissions/permission_service_impl.h
+++ b/content/browser/permissions/permission_service_impl.h
@@ -56,17 +56,30 @@ class PermissionServiceImpl : public mojo::InterfaceImpl<PermissionService> {
       PermissionName permission,
       const mojo::String& origin,
       const mojo::Callback<void(PermissionStatus)>& callback) override;
+  void GetNextPermissionChange(
+      PermissionName permission,
+      const mojo::String& origin,
+      PermissionStatus last_known_status,
+      const mojo::Callback<void(PermissionStatus)>& callback) override;
 
   // mojo::InterfaceImpl.
   void OnConnectionError() override;
 
   void OnRequestPermissionResponse(
-    const mojo::Callback<void(PermissionStatus)>& callback,
-    int request_id,
-    PermissionStatus status);
-
-  PermissionStatus GetPermissionStatus(PermissionType type, GURL origin);
-  void ResetPermissionStatus(PermissionType type, GURL origin);
+      const mojo::Callback<void(PermissionStatus)>& callback,
+      int request_id,
+      PermissionStatus status);
+
+  PermissionStatus GetPermissionStatusFromName(PermissionName permission,
+                                               const GURL& origin);
+  PermissionStatus GetPermissionStatusFromType(PermissionType type,
+                                               const GURL& origin);
+  void ResetPermissionStatus(PermissionType type, const GURL& origin);
+
+  void OnPermissionStatusChanged(
+      const mojo::Callback<void(PermissionStatus)>& callback,
+      int* subscription_id,
+      PermissionStatus status);
 
   RequestsMap pending_requests_;
   // context_ owns |this|.