base/features.cc

   1 // Copyright 2022 The Chromium Authors
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "base/features.h"
   6 #include "base/feature_list.h"
   7
   8 namespace base::features {
   9
  10 // Alphabetical:
  11
  12 // Enforce that writeable file handles passed to untrusted processes are not
  13 // backed by executable files.
  14 BASE_FEATURE(kEnforceNoExecutableFileHandles,
  15              "EnforceNoExecutableFileHandles",
  16              FEATURE_ENABLED_BY_DEFAULT);
  17
  18 // TODO(crbug.com/851128): Roll out this to 100% before replacing existing
  19 // NOTREACHED()s with NOTREACHED_NORETURN() as part of NOTREACHED() migration.
  20 // Note that a prerequisite for rolling out this experiment is that existing
  21 // NOTREACHED reports are at a very low rate. Once this rolls out we should
  22 // monitor that crash rates for the experiment population is within a 1-5% or
  23 // lower than the control group.
  24 BASE_FEATURE(kNotReachedIsFatal,
  25              "NotReachedIsFatal",
  26              FEATURE_DISABLED_BY_DEFAULT);
  27
  28 // Optimizes parsing and loading of data: URLs.
  29 BASE_FEATURE(kOptimizeDataUrls, "OptimizeDataUrls", FEATURE_ENABLED_BY_DEFAULT);
  30
  31 BASE_FEATURE(kUseRustJsonParser,
  32              "UseRustJsonParser",
  33              FEATURE_DISABLED_BY_DEFAULT);
  34
  35 BASE_FEATURE(kJsonNegativeZero, "JsonNegativeZero", FEATURE_ENABLED_BY_DEFAULT);
  36
  37 #if BUILDFLAG(IS_ANDROID) || BUILDFLAG(IS_CHROMEOS)
  38 // Force to enable LowEndDeviceMode partially on Android 3Gb devices.
  39 // (see PartialLowEndModeOnMidRangeDevices below)
  40 BASE_FEATURE(kPartialLowEndModeOn3GbDevices,
  41              "PartialLowEndModeOn3GbDevices",
  42              base::FEATURE_DISABLED_BY_DEFAULT);
  43
  44 // Used to enable LowEndDeviceMode partially on Android and ChromeOS mid-range
  45 // devices. Such devices aren't considered low-end, but we'd like experiment
  46 // with a subset of low-end features to see if we get a good memory vs.
  47 // performance tradeoff.
  48 //
  49 // TODO(crbug.com/1434873): |#if| out 32-bit before launching or going to
  50 // high Stable %, because we will enable the feature only for <8GB 64-bit
  51 // devices, where we didn't ship yet. However, we first need a larger
  52 // population to collect data.
  53 BASE_FEATURE(kPartialLowEndModeOnMidRangeDevices,
  54              "PartialLowEndModeOnMidRangeDevices",
  55 #if BUILDFLAG(IS_ANDROID)
  56              base::FEATURE_ENABLED_BY_DEFAULT);
  57 #elif BUILDFLAG(IS_CHROMEOS)
  58              base::FEATURE_DISABLED_BY_DEFAULT);
  59 #endif
  60
  61 #endif  // BUILDFLAG(IS_ANDROID) || BUILDFLAG(IS_CHROMEOS)
  62
  63 #if BUILDFLAG(IS_ANDROID)
  64 // Whether to report frame metrics to the Android.FrameTimeline.* histograms.
  65 BASE_FEATURE(kCollectAndroidFrameTimelineMetrics,
  66              "CollectAndroidFrameTimelineMetrics",
  67              base::FEATURE_DISABLED_BY_DEFAULT);
  68 #endif  // BUILDFLAG(IS_ANDROID)
  69
  70 }  // namespace base::features