chrome/browser/chrome_browser_field_trials.h

// Copyright (c) 2012 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 CHROME_BROWSER_CHROME_BROWSER_FIELD_TRIALS_H_
#define CHROME_BROWSER_CHROME_BROWSER_FIELD_TRIALS_H_

#include "base/macros.h"
#include "components/variations/platform_field_trials.h"

class PrefService;

namespace base {
class FeatureList;
}

class ChromeBrowserFieldTrials : public variations::PlatformFieldTrials {
 public:
  explicit ChromeBrowserFieldTrials(PrefService* local_state);

  ChromeBrowserFieldTrials(const ChromeBrowserFieldTrials&) = delete;
  ChromeBrowserFieldTrials& operator=(const ChromeBrowserFieldTrials&) = delete;

  ~ChromeBrowserFieldTrials() override;

  // variations::PlatformFieldTrials:
  void SetUpFieldTrials() override;
  void SetUpFeatureControllingFieldTrials(
      bool has_seed,
      const base::FieldTrial::EntropyProvider* low_entropy_provider,
      base::FeatureList* feature_list) override;
  void RegisterSyntheticTrials() override;

 private:
  // Instantiates dynamic trials by querying their state, to ensure they get
  // reported as used.
  void InstantiateDynamicTrials();

  // Weak pointer to the local state prefs store.
  PrefService* const local_state_;
};

#endif  // CHROME_BROWSER_CHROME_BROWSER_FIELD_TRIALS_H_