chromium/chrome/browser/ui/recently_audible_helper.h

// Copyright 2018 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_UI_RECENTLY_AUDIBLE_HELPER_H_
#define CHROME_BROWSER_UI_RECENTLY_AUDIBLE_HELPER_H_

#include "base/callback_list.h"
#include "base/memory/raw_ptr.h"
#include "base/time/time.h"
#include "base/timer/timer.h"
#include "content/public/browser/web_contents_observer.h"
#include "content/public/browser/web_contents_user_data.h"

namespace base {
class TickClock;
}

// A helper that observers tab audibility and calculates whether or not a tab
// is recently audible. This is used to make the "audio playing" icon persist
// for a short period after audio stops. This class is only safe to use from the
// UI thread.
class RecentlyAudibleHelper
    : public content::WebContentsObserver,
      public content::WebContentsUserData<RecentlyAudibleHelper> { … };

#endif  // CHROME_BROWSER_UI_RECENTLY_AUDIBLE_HELPER_H_