base/features.cc

// 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.

#include "base/features.h"
#include "base/feature_list.h"

namespace base::features {

// Alphabetical:

// Enforce that writeable file handles passed to untrusted processes are not
// backed by executable files.
BASE_FEATURE(kEnforceNoExecutableFileHandles,
             "EnforceNoExecutableFileHandles",
             FEATURE_ENABLED_BY_DEFAULT);

// TODO(crbug.com/851128): Roll out this to 100% before replacing existing
// NOTREACHED()s with NOTREACHED_NORETURN() as part of NOTREACHED() migration.
// Note that a prerequisite for rolling out this experiment is that existing
// NOTREACHED reports are at a very low rate. Once this rolls out we should
// monitor that crash rates for the experiment population is within a 1-5% or
// lower than the control group.
BASE_FEATURE(kNotReachedIsFatal,
             "NotReachedIsFatal",
             FEATURE_DISABLED_BY_DEFAULT);

// Optimizes parsing and loading of data: URLs.
BASE_FEATURE(kOptimizeDataUrls, "OptimizeDataUrls", FEATURE_ENABLED_BY_DEFAULT);

BASE_FEATURE(kSupportsUserDataFlatHashMap,
             "SupportsUserDataFlatHashMap",
             FEATURE_DISABLED_BY_DEFAULT);

#if BUILDFLAG(IS_ANDROID)
// Force to enable LowEndDeviceMode partially on Android mid-range devices.
// Such devices aren't considered low-end, but we'd like experiment with
// a subset of low-end features to see if we get a good memory vs. performance
// tradeoff.
//
// TODO(crbug.com/1434873): |#if| out 32-bit before launching or going to
// high Stable %, because we will enable the feature only for <8GB 64-bit
// devices, where we didn't ship yet. However, we first need a larger
// population to collect data.
BASE_FEATURE(kPartialLowEndModeOnMidRangeDevices,
             "PartialLowEndModeOnMidRangeDevices",
             base::FEATURE_DISABLED_BY_DEFAULT);

// A parameter to exclude or not exclude LowEndBackgroundCleanup from
// PartialLowModeOnMidRangeDevices. This is used to see how
// LowEndBackGroundCleanup affects total count of memory.gpu.privatefootprints.
const FeatureParam<bool> kPartialLowEndModeExcludeLowEndBackgroundCleanup{
    &kPartialLowEndModeOnMidRangeDevices, "exculde-low-end-background-cleanup",
    false};

#endif  // BUILDFLAG(IS_ANDROID)

}  // namespace base::features