chromium/ui/latency/latency_info.h

// Copyright 2013 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef UI_LATENCY_LATENCY_INFO_H_
#define UI_LATENCY_LATENCY_INFO_H_

#include <vector>

#include "base/containers/flat_map.h"
#include "base/time/time.h"
#include "build/blink_buildflags.h"
#include "build/build_config.h"
#include "third_party/perfetto/protos/perfetto/trace/track_event/chrome_latency_info.pbzero.h"

#if BUILDFLAG(USE_BLINK)
#include "ipc/ipc_param_traits.h"  // nogncheck
#include "mojo/public/cpp/bindings/struct_traits.h"  // nogncheck
#endif

namespace ui {

#if BUILDFLAG(USE_BLINK)
namespace mojom {
class LatencyInfoDataView;
}
#endif

// When adding new components, or new metrics based on LatencyInfo,
// please update latency_info.dot.
//
// When adding new components, please update
// //third_party/perfetto/protos/perfetto/trace/track_event/chrome_latency_info.proto
// so both this and the internal versions can be kept up to date. Or reach out
// to [email protected] so we can assist.
enum LatencyComponentType { … };

class LatencyInfo { … };

// This is declared here for use in gtest-based unit tests, but is defined in
// //ui/latency:test_support target.
// Without this the default PrintTo template in gtest tries to pass LatencyInfo
// by value, which leads to an alignment compile error on Windows.
void PrintTo(const LatencyInfo& latency, ::std::ostream* os);

}  // namespace ui

#endif  // UI_LATENCY_LATENCY_INFO_H_