chromium/components/performance_manager/public/performance_manager_main_thread_observer.h

// Copyright 2019 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_PERFORMANCE_MANAGER_PUBLIC_PERFORMANCE_MANAGER_MAIN_THREAD_OBSERVER_H_
#define COMPONENTS_PERFORMANCE_MANAGER_PUBLIC_PERFORMANCE_MANAGER_MAIN_THREAD_OBSERVER_H_

#include "base/observer_list_types.h"

namespace content {
class WebContents;
}  // namespace content

namespace performance_manager {

// Interface to observe PerformanceManager events that happen on the main
// thread. All methods are invoked on the main thread.
class PerformanceManagerMainThreadObserver : public base::CheckedObserver { … };

// A default implementation of the observer, with all methods stubbed out.
class PerformanceManagerMainThreadObserverDefaultImpl
    : public PerformanceManagerMainThreadObserver { … };

}  // namespace performance_manager

#endif  // COMPONENTS_PERFORMANCE_MANAGER_PUBLIC_PERFORMANCE_MANAGER_MAIN_THREAD_OBSERVER_H_