chromium/chrome/browser/metrics/tab_stats/tab_stats_observer.h

// Copyright 2021 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef CHROME_BROWSER_METRICS_TAB_STATS_TAB_STATS_OBSERVER_H_
#define CHROME_BROWSER_METRICS_TAB_STATS_TAB_STATS_OBSERVER_H_

#include "base/observer_list_types.h"
#include "content/public/browser/visibility.h"

namespace content {
class WebContents;
}  // namespace content

namespace metrics {

// Defines an interface for a class used to handle tab and window related stats.
// Handling the events can be either storing them for logging purposes,
// forwarding them to another class or taking reactive measures when certain
// criteria are met. Subclasses do not have to react to all events so default
// noop functions are provided.
class TabStatsObserver : public base::CheckedObserver { … };

}  // namespace metrics

#endif  // CHROME_BROWSER_METRICS_TAB_STATS_TAB_STATS_OBSERVER_H_