chromium/components/page_load_metrics/browser/observers/assert_page_load_metrics_observer.h

// Copyright 2022 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef COMPONENTS_PAGE_LOAD_METRICS_BROWSER_OBSERVERS_ASSERT_PAGE_LOAD_METRICS_OBSERVER_H_
#define COMPONENTS_PAGE_LOAD_METRICS_BROWSER_OBSERVERS_ASSERT_PAGE_LOAD_METRICS_OBSERVER_H_

#include "components/page_load_metrics/browser/page_load_metrics_observer_interface.h"

// Asserts the constraints of methods of PageLoadMetricsObserver using
// ovserver-level forwarding (i.e. PageLoadMetricsForwardObserver) as code and
// checks the behavior in browsertests of PageLoadMetricsObservers.
//
// This class will be added iff `DCHECK_IS_ON()`.
//
// The list of methods are not complete. For most ones among missing ones, we
// have no (non trivial) assumption on callback timings.
//
// Note that this inherits PageLoadMetricsObserverInterface rather than
// PageLoadMetricsObserver to encourage to write assertions for newly added
// methods.
class AssertPageLoadMetricsObserver final
    : public page_load_metrics::PageLoadMetricsObserverInterface { … };

#endif  // COMPONENTS_PAGE_LOAD_METRICS_BROWSER_OBSERVERS_ASSERT_PAGE_LOAD_METRICS_OBSERVER_H_