components/ntp_tiles/features.h

// Copyright 2019 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_NTP_TILES_FEATURES_H_
#define COMPONENTS_NTP_TILES_FEATURES_H_

#include "base/feature_list.h"

namespace ntp_tiles {

// Experiment groups for the new tab page field trial experiments.
enum class NewTabPageFieldTrialExperimentBehavior {
  // Default.
  kDefault = 0,
  // Hides all NTP tiles for new users.
  kTileAblationHideAll = 1,
  // Hides most visited tiles for new users.
  kTileAblationHideMVTOnly = 2,
  // Control group for tile ablation.
  kTileAblationControl = 3,
};

// Name of the field trial to configure PopularSites.
extern const char kPopularSitesFieldTrialName[];

// This feature is enabled by default. Otherwise, users who need it would not
// get the right configuration timely enough. The configuration affects only
// Android or iOS users.
BASE_DECLARE_FEATURE(kPopularSitesBakedInContentFeature);

// Feature to allow the new Google favicon server for fetching favicons for Most
// Likely tiles on the New Tab Page.
BASE_DECLARE_FEATURE(kNtpMostLikelyFaviconsFromServerFeature);

// If this feature is enabled, we enable popular sites in the suggestions UI.
BASE_DECLARE_FEATURE(kUsePopularSitesSuggestions);

// Feature flag to enable new tab page field trial experiment on IOS.
// Use `GetNewTabPageFieldTrialExperimentType()` instead of this
// constant directly.
BASE_DECLARE_FEATURE(kNewTabPageFieldTrial);

// Feature name for the NTP field trial.
extern const char kNewTabPageFieldTrialName[];

// Feature parameters for the new tab page experiment.
extern const char kNewTabPageFieldTrialParam[];

// Returns the currently enabled NTP field trial experiment type. If none are
// enabled, returns the default value.
NewTabPageFieldTrialExperimentBehavior GetNewTabPageFieldTrialExperimentType();

}  // namespace ntp_tiles

#endif  // COMPONENTS_NTP_TILES_FEATURES_H_