chromium/components/page_load_metrics/browser/page_load_metrics_update_dispatcher.h

// Copyright 2017 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_PAGE_LOAD_METRICS_BROWSER_PAGE_LOAD_METRICS_UPDATE_DISPATCHER_H_
#define COMPONENTS_PAGE_LOAD_METRICS_BROWSER_PAGE_LOAD_METRICS_UPDATE_DISPATCHER_H_

#include <map>
#include <memory>

#include "base/memory/raw_ptr.h"
#include "base/time/time.h"
#include "base/timer/timer.h"
#include "components/page_load_metrics/browser/layout_shift_normalization.h"
#include "components/page_load_metrics/browser/page_load_metrics_observer.h"
#include "components/page_load_metrics/browser/page_load_metrics_observer_delegate.h"
#include "components/page_load_metrics/browser/responsiveness_metrics_normalization.h"
#include "components/page_load_metrics/common/page_load_metrics.mojom.h"

namespace content {
class NavigationHandle;
class RenderFrameHost;
}  // namespace content

namespace page_load_metrics {

class PageLoadMetricsEmbedderInterface;

namespace internal {

enum class PageLoadTrackerPageType;

// Used to track the status of PageLoadTimings received from the render process.
//
// These values are recorded in histograms. Entries should not be renumbered
// and numeric values should never be reused.
//
// If you add elements to this enum, make sure you update the enum value in
// histograms.xml. Only add elements to the end to prevent inconsistencies
// between versions.
// LINT.IfChange(PageLoadTimingStatus)
enum PageLoadTimingStatus { … };
// LINT.ThenChange(//tools/metrics/histograms/metadata/page/enums.xml:PageLoadTimingStatus)

extern const char kPageLoadTimingStatus[];

}  // namespace internal

// PageLoadMetricsUpdateDispatcher manages updates to page load metrics data,
// and dispatches them to the Client. PageLoadMetricsUpdateDispatcher may delay
// dispatching metrics updates to the Client in cases where metrics state hasn't
// stabilized.
class PageLoadMetricsUpdateDispatcher { … };

}  // namespace page_load_metrics

#endif  // COMPONENTS_PAGE_LOAD_METRICS_BROWSER_PAGE_LOAD_METRICS_UPDATE_DISPATCHER_H_