chromium/content/common/process_visibility_tracker.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 CONTENT_COMMON_PROCESS_VISIBILITY_TRACKER_H_
#define CONTENT_COMMON_PROCESS_VISIBILITY_TRACKER_H_

#include <optional>

#include "base/memory/scoped_refptr.h"
#include "base/no_destructor.h"
#include "base/observer_list_threadsafe.h"
#include "base/sequence_checker.h"
#include "base/synchronization/lock.h"
#include "base/thread_annotations.h"
#include "content/common/content_export.h"

namespace content {

// This class represents overall on-screen visibility for a given process of the
// embedding application. Currently only works/is used in the browser process on
// Android (Chrome and WebView).
// TODO(crbug.com/40168826): implement usage in other processes.
// Observers can be added from any sequence, but OnProcessVisibilityChanged()
// should be called from the thread that created the tracker instance.
class CONTENT_EXPORT ProcessVisibilityTracker { … };

}  // namespace content

#endif  // CONTENT_COMMON_PROCESS_VISIBILITY_TRACKER_H_