chromium/content/browser/tracing/tracing_scenario.h

// Copyright 2023 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_BROWSER_TRACING_TRACING_SCENARIO_H_
#define CONTENT_BROWSER_TRACING_TRACING_SCENARIO_H_

#include "base/cancelable_callback.h"
#include "base/memory/weak_ptr.h"
#include "base/sequence_checker.h"
#include "base/task/sequenced_task_runner.h"
#include "base/token.h"
#include "base/trace_event/trace_config.h"
#include "content/browser/tracing/background_tracing_rule.h"
#include "content/common/content_export.h"
#include "services/tracing/public/cpp/perfetto/perfetto_config.h"
#include "third_party/perfetto/include/perfetto/tracing/tracing.h"
#include "third_party/perfetto/protos/perfetto/config/chrome/scenario_config.gen.h"

namespace content {

class CONTENT_EXPORT TracingScenarioBase { … };

// NestedTracingScenario manages triggers for a single nested tracing
// scenario. Unlike TracingScenario below, it doesn't manage a tracing
// session, but inherits from the parent's session instead.
class CONTENT_EXPORT NestedTracingScenario : public TracingScenarioBase { … };

// TracingScenario manages triggers and tracing session for a single field
// tracing scenario. TracingScenario allows for multiple scenarios to be enabled
// and watch for rules at once, and is meant to replace
// BackgroundTracingActiveScenario.
// TODO(crbug.com/40257548): Update the comment above once
// BackgroundTracingActiveScenario is deleted.
class CONTENT_EXPORT TracingScenario : public TracingScenarioBase,
                                       public NestedTracingScenario::Delegate { … };

}  // namespace content

#endif  // CONTENT_BROWSER_TRACING_TRACING_SCENARIO_H_