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// Copyright 2015 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef COMPONENTS_VARIATIONS_SYNTHETIC_TRIALS_H_
#define COMPONENTS_VARIATIONS_SYNTHETIC_TRIALS_H_
#include <stdint.h>
#include <vector>
#include "base/compiler_specific.h"
#include "base/time/time.h"
#include "components/variations/active_field_trials.h"
namespace variations {
// A Field Trial and its selected group, which represent a particular
// Chrome configuration state. For example, the trial name could map to
// a preference name, and the group name could map to a preference value.
struct SyntheticTrialGroup {
public:
SyntheticTrialGroup(uint32_t trial, uint32_t group);
~SyntheticTrialGroup();
ActiveGroupId id;
base::TimeTicks start_time;
};
// Interface class to observe changes to synthetic trials in MetricsService.
class SyntheticTrialObserver {
public:
// Called when the list of synthetic field trial groups has changed.
virtual void OnSyntheticTrialsChanged(
const std::vector<SyntheticTrialGroup>& groups) = 0;
protected:
virtual ~SyntheticTrialObserver() {}
};
} // namespace variations
#endif // COMPONENTS_VARIATIONS_SYNTHETIC_TRIALS_H_
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