chromium/components/performance_manager/decorators/page_load_tracker_decorator.h

// Copyright 2020 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_DECORATORS_PAGE_LOAD_TRACKER_DECORATOR_H_
#define COMPONENTS_PERFORMANCE_MANAGER_DECORATORS_PAGE_LOAD_TRACKER_DECORATOR_H_

#include "base/time/time.h"
#include "base/timer/timer.h"
#include "components/performance_manager/decorators/page_load_tracker_decorator_data.h"
#include "components/performance_manager/public/graph/frame_node.h"
#include "components/performance_manager/public/graph/graph.h"
#include "components/performance_manager/public/graph/node_data_describer.h"
#include "components/performance_manager/public/graph/page_node.h"
#include "components/performance_manager/public/graph/process_node.h"

namespace performance_manager {

class FrameNodeImpl;
class PageNodeImpl;
class ProcessNodeImpl;

// The PageLoadTracker decorator is responsible for determining when a page is
// loading. A page starts loading when incoming data starts arriving for a
// top-level load to a different document. It stops loading when it reaches an
// "almost idle" state, based on CPU and network quiescence, or after an
// absolute timeout. This state is then updated on PageNodes in a graph.
class PageLoadTrackerDecorator : public FrameNode::ObserverDefaultImpl,
                                 public GraphOwnedDefaultImpl,
                                 public NodeDataDescriberDefaultImpl,
                                 public ProcessNode::ObserverDefaultImpl { … };

}  // namespace performance_manager

#endif  // COMPONENTS_PERFORMANCE_MANAGER_DECORATORS_PAGE_LOAD_TRACKER_DECORATOR_H_