permissions: handle request ids for permissions in permission manager

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 b83a6973f06692f8f8df961a9041465194f47abf..26321870d3d7bcd6d210410a76496d5245f4742a 100644
--- a/content/browser/permissions/permission_service_impl.h
+++ b/content/browser/permissions/permission_service_impl.h
@@ -48,6 +48,8 @@ class PermissionServiceImpl : public PermissionService {
                    const PermissionStatusCallback& callback);
     ~PendingRequest();
 
+    // Request ID received from the PermissionManager.
+    int id;
     PermissionType permission;
     GURL origin;
     PermissionStatusCallback callback;