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// Copyright 2022 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef BASE_FEATURES_H_
#define BASE_FEATURES_H_
#include "base/base_export.h"
#include "base/feature_list.h"
#include "base/metrics/field_trial_params.h"
namespace base::features {
// All features in alphabetical order. The features should be documented
// alongside the definition of their values in the .cc file.
// Alphabetical:
BASE_EXPORT BASE_DECLARE_FEATURE(kFeatureParamWithCache);
BASE_EXPORT BASE_DECLARE_FEATURE(kFastFilePathIsParent);
BASE_EXPORT BASE_DECLARE_FEATURE_PARAM(bool,
kUseRustJsonParserInCurrentSequence);
BASE_EXPORT BASE_DECLARE_FEATURE(kLowEndMemoryExperiment);
BASE_EXPORT BASE_DECLARE_FEATURE_PARAM(size_t, kLowMemoryDeviceThresholdMB);
// PPM: Poor performance moment.
//
// This feature covers fixes to many egregious performance problems and the goal
// is to measure their aggregated impact.
BASE_EXPORT BASE_DECLARE_FEATURE(kReducePPMs);
#if BUILDFLAG(IS_ANDROID) || BUILDFLAG(IS_CHROMEOS)
BASE_EXPORT BASE_DECLARE_FEATURE(kPartialLowEndModeOn3GbDevices);
BASE_EXPORT BASE_DECLARE_FEATURE(kPartialLowEndModeOnMidRangeDevices);
#endif
#if BUILDFLAG(IS_ANDROID)
BASE_EXPORT BASE_DECLARE_FEATURE(kBackgroundNotPerceptibleBinding);
BASE_EXPORT BASE_DECLARE_FEATURE(kCollectAndroidFrameTimelineMetrics);
BASE_EXPORT BASE_DECLARE_FEATURE(
kPostPowerMonitorBroadcastReceiverInitToBackground);
BASE_EXPORT BASE_DECLARE_FEATURE(kPostGetMyMemoryStateToBackground);
BASE_EXPORT BASE_DECLARE_FEATURE(kUpdateStateBeforeUnbinding);
BASE_EXPORT BASE_DECLARE_FEATURE(kUseSharedRebindServiceConnection);
BASE_EXPORT BASE_DECLARE_FEATURE(kBackgroundThreadPoolFieldTrial);
BASE_EXPORT BASE_DECLARE_FEATURE_PARAM(int,
kBackgroundThreadPoolFieldTrialConfig);
#endif
// Whether the ReducePPMs feature is enabled. Unlike
// `FeatureList::IsEnabled(base::features::kReducePPMs)`, this can be called
// racily with initializing the FeatureList (although the return value might not
// reflect the state of the feature in the FeatureList in that case).
BASE_EXPORT bool IsReducePPMsEnabled();
// Policy for emitting profiler metadata from `ThreadController`.
enum class EmitThreadControllerProfilerMetadata {
// Always emit metadata.
kForce,
// Emit metadata only if enabled via the `FeatureList`.
kFeatureDependent,
};
// Initializes global variables that depend on `FeatureList`. Must be invoked
// early on process startup, but after `FeatureList` initialization. Different
// parts of //base read experiment state from global variables instead of
// directly from `FeatureList` to avoid data races (default values are used
// before this function is called to initialize the global variables).
BASE_EXPORT void Init(EmitThreadControllerProfilerMetadata
emit_thread_controller_profiler_metadata);
} // namespace base::features
#endif // BASE_FEATURES_H_
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