chrome/browser/browser_features.cc

   1 // Copyright 2018 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 "chrome/browser/browser_features.h"
   6
   7 #include "base/feature_list.h"
   8 #include "build/branding_buildflags.h"
   9 #include "build/build_config.h"
  10 #include "build/chromeos_buildflags.h"
  11
  12 #if BUILDFLAG(IS_WIN)
  13 #include "chrome/browser/net/system_network_context_manager.h"
  14 #endif
  15
  16 namespace features {
  17
  18 // Enables using the ClosedTabCache to instantly restore recently closed tabs
  19 // using the "Reopen Closed Tab" button.
  20 BASE_FEATURE(kClosedTabCache,
  21              "ClosedTabCache",
  22              base::FEATURE_DISABLED_BY_DEFAULT);
  23
  24 // Destroy profiles when their last browser window is closed, instead of when
  25 // the browser exits.
  26 // On Lacros the feature is enabled only for secondary profiles, check the
  27 // implementation of `ProfileManager::ProfileInfo::FromUnownedProfile()`.
  28 BASE_FEATURE(kDestroyProfileOnBrowserClose,
  29              "DestroyProfileOnBrowserClose",
  30 #if BUILDFLAG(IS_LINUX) || BUILDFLAG(IS_MAC) || BUILDFLAG(IS_WIN) || \
  31     BUILDFLAG(IS_CHROMEOS_LACROS)
  32              base::FEATURE_ENABLED_BY_DEFAULT);
  33 #else
  34              base::FEATURE_DISABLED_BY_DEFAULT);
  35 #endif
  36
  37 // DestroyProfileOnBrowserClose only covers deleting regular (non-System)
  38 // Profiles. This flags lets us destroy the System Profile, as well.
  39 BASE_FEATURE(kDestroySystemProfiles,
  40              "DestroySystemProfiles",
  41              base::FEATURE_DISABLED_BY_DEFAULT);
  42
  43 // Let DevTools front-end talk to the target of type "tab" rather than
  44 // "frame" when inspecting a WebContents.
  45 BASE_FEATURE(kDevToolsTabTarget,
  46              "DevToolsTabTarget",
  47              base::FEATURE_ENABLED_BY_DEFAULT);
  48
  49 // Let DevTools front-end log extensive VisualElements-style UMA metrics for
  50 // impressions and interactions.
  51 BASE_FEATURE(kDevToolsVeLogging,
  52              "DevToolsVeLogging",
  53              base::FEATURE_DISABLED_BY_DEFAULT);
  54
  55 // Nukes profile directory before creating a new profile using
  56 // ProfileManager::CreateMultiProfileAsync().
  57 BASE_FEATURE(kNukeProfileBeforeCreateMultiAsync,
  58              "NukeProfileBeforeCreateMultiAsync",
  59              base::FEATURE_ENABLED_BY_DEFAULT);
  60
  61 // Enables executing the browser commands sent by the NTP promos.
  62 BASE_FEATURE(kPromoBrowserCommands,
  63              "PromoBrowserCommands",
  64              base::FEATURE_ENABLED_BY_DEFAULT);
  65
  66 // Parameter name for the promo browser command ID provided along with
  67 // kPromoBrowserCommands.
  68 // The value of this parameter should be parsable as an unsigned integer and
  69 // should map to one of the browser commands specified in:
  70 // ui/webui/resources/js/browser_command/browser_command.mojom
  71 const char kBrowserCommandIdParam[] = "BrowserCommandIdParam";
  72
  73 #if BUILDFLAG(IS_CHROMEOS_ASH)
  74 // Enables reading and writing PWA notification permissions from quick settings
  75 // menu.
  76 BASE_FEATURE(kQuickSettingsPWANotifications,
  77              "QuickSettingsPWA",
  78              base::FEATURE_DISABLED_BY_DEFAULT);
  79 #endif
  80
  81 #if BUILDFLAG(IS_CHROMEOS)
  82 // Enables being able to zoom a web page by double tapping in Chrome OS tablet
  83 // mode.
  84 BASE_FEATURE(kDoubleTapToZoomInTabletMode,
  85              "DoubleTapToZoomInTabletMode",
  86              base::FEATURE_DISABLED_BY_DEFAULT);
  87 #endif
  88
  89 #if !BUILDFLAG(IS_ANDROID)
  90 // Adds an item to the context menu that copies a link to the page with the
  91 // selected text highlighted.
  92 BASE_FEATURE(kCopyLinkToText,
  93              "CopyLinkToText",
  94              base::FEATURE_ENABLED_BY_DEFAULT);
  95
  96 // Adds a "Snooze" action to mute notifications during screen sharing sessions.
  97 BASE_FEATURE(kMuteNotificationSnoozeAction,
  98              "MuteNotificationSnoozeAction",
  99              base::FEATURE_DISABLED_BY_DEFAULT);
 100 #endif
 101
 102 // Gates sandboxed iframe navigation toward external protocol behind any of:
 103 // - allow-top-navigation
 104 // - allow-top-navigation-to-custom-protocols
 105 // - allow-top-navigation-with-user-gesture (+ user gesture)
 106 // - allow-popups
 107 //
 108 // Motivation:
 109 // Developers are surprised that a sandboxed iframe can navigate and/or
 110 // redirect the user toward an external application.
 111 // General iframe navigation in sandboxed iframe are not blocked normally,
 112 // because they stay within the iframe. However they can be seen as a popup or
 113 // a top-level navigation when it leads to opening an external application. In
 114 // this case, it makes sense to extend the scope of sandbox flags, to block
 115 // malvertising.
 116 //
 117 // Implementation bug: https://crbug.com/1253379
 118 // I2S: https://groups.google.com/a/chromium.org/g/blink-dev/c/-t-f7I6VvOI
 119 //
 120 // Enabled in M103. Flag to be removed in M106
 121 BASE_FEATURE(kSandboxExternalProtocolBlocked,
 122              "SandboxExternalProtocolBlocked",
 123              base::FEATURE_ENABLED_BY_DEFAULT);
 124 // Enabled in M100. Flag to be removed in M106
 125 BASE_FEATURE(kSandboxExternalProtocolBlockedWarning,
 126              "SandboxExternalProtocolBlockedWarning",
 127              base::FEATURE_ENABLED_BY_DEFAULT);
 128
 129 // Enables migration of the network context data from `unsandboxed_data_path` to
 130 // `data_path`. See the explanation in network_context.mojom.
 131 BASE_FEATURE(kTriggerNetworkDataMigration,
 132              "TriggerNetworkDataMigration",
 133 #if BUILDFLAG(IS_WIN)
 134              base::FEATURE_ENABLED_BY_DEFAULT
 135 #else
 136              base::FEATURE_DISABLED_BY_DEFAULT
 137 #endif
 138 );
 139
 140 #if BUILDFLAG(IS_CHROMEOS)
 141 // If enabled, a blue border is drawn around shared tabs on ChromeOS.
 142 // If disabled, the blue border is not used on ChromeOS.
 143 //
 144 // Motivation:
 145 //  The blue border behavior used to cause problems on ChromeOS - see
 146 //  crbug.com/1320262 for Ash (fixed) and crbug.com/1030925 for Lacros
 147 //  (relatively old bug - we would like to observe whether it's still
 148 //  there). This flag is introduced as means of disabling this feature in case
 149 //  of possible future regressions.
 150 //
 151 // TODO(crbug.com/1251999): Remove this flag once we confirm that blue border
 152 // works fine on ChromeOS.
 153 //
 154 // b/279051234: We suspect the tab sharing blue border may cause a bad issue
 155 // on ChromeOS where a window can not be interacted at all. Disable the feature
 156 // on ChromeOS.
 157 BASE_FEATURE(kTabCaptureBlueBorderCrOS,
 158              "TabCaptureBlueBorderCrOS",
 159              base::FEATURE_DISABLED_BY_DEFAULT);
 160 #endif
 161
 162 // Enables runtime detection of USB devices which provide a WebUSB landing page
 163 // descriptor.
 164 BASE_FEATURE(kWebUsbDeviceDetection,
 165              "WebUsbDeviceDetection",
 166              base::FEATURE_ENABLED_BY_DEFAULT);
 167
 168 // Enables Certificate Transparency on Desktop.
 169 // Enabling CT enforcement requires maintaining a log policy, and the ability to
 170 // update the list of accepted logs. Embedders who are planning to enable this
 171 // should first reach out to chrome-certificate-transparency@google.com.
 172 BASE_FEATURE(kCertificateTransparencyAskBeforeEnabling,
 173              "CertificateTransparencyAskBeforeEnabling",
 174 #if BUILDFLAG(GOOGLE_CHROME_BRANDING)
 175              base::FEATURE_ENABLED_BY_DEFAULT);
 176 #else
 177              base::FEATURE_DISABLED_BY_DEFAULT);
 178 #endif  // BUILDFLAG(GOOGLE_CHROME_BRANDING)
 179
 180 BASE_FEATURE(kLargeFaviconFromGoogle,
 181              "LargeFaviconFromGoogle",
 182              base::FEATURE_DISABLED_BY_DEFAULT);
 183 const base::FeatureParam<int> kLargeFaviconFromGoogleSizeInDip{
 184     &kLargeFaviconFromGoogle, "favicon_size_in_dip", 128};
 185
 186 // Controls whether the static key pinning list can be updated via component
 187 // updater.
 188 BASE_FEATURE(kKeyPinningComponentUpdater,
 189              "KeyPinningComponentUpdater",
 190              base::FEATURE_ENABLED_BY_DEFAULT);
 191
 192 // When this feature is enabled, the network service will restart unsandboxed if
 193 // a previous attempt to launch it sandboxed failed.
 194 BASE_FEATURE(kRestartNetworkServiceUnsandboxedForFailedLaunch,
 195              "RestartNetworkServiceUnsandboxedForFailedLaunch",
 196              base::FEATURE_ENABLED_BY_DEFAULT);
 197
 198 #if BUILDFLAG(IS_WIN)
 199 // When this feature is enabled, metrics are gathered regarding the performance
 200 // and reliability of app-bound encryption primitives on a background thread.
 201 BASE_FEATURE(kAppBoundEncryptionMetrics,
 202              "AppBoundEncryptionMetrics",
 203              base::FEATURE_ENABLED_BY_DEFAULT);
 204
 205 // Enables locking the cookie database for profiles.
 206 // TODO(crbug.com/1430226): Remove after fully launched.
 207 BASE_FEATURE(kLockProfileCookieDatabase,
 208              "LockProfileCookieDatabase",
 209              base::FEATURE_ENABLED_BY_DEFAULT);
 210
 211 // Don't call the Win32 API PrefetchVirtualMemory when loading chrome.dll inside
 212 // non-browser processes. This is done by passing flags to these processes. This
 213 // prevents pulling the entirety of chrome.dll into physical memory (albeit only
 214 // pri-2 physical memory) under the assumption that during chrome execution,
 215 // portions of the DLL which are used will already be present, hopefully leading
 216 // to less needless memory consumption.
 217 BASE_FEATURE(kNoPreReadMainDll,
 218              "NoPreReadMainDll",
 219              base::FEATURE_DISABLED_BY_DEFAULT);
 220 #endif
 221
 222 // Enables showing the email of the flex org admin that setup CBCM in the
 223 // management disclosures.
 224 #if BUILDFLAG(IS_CHROMEOS)
 225 BASE_FEATURE(kFlexOrgManagementDisclosure,
 226              "FlexOrgManagementDisclosure",
 227              base::FEATURE_DISABLED_BY_DEFAULT);
 228 #else
 229 BASE_FEATURE(kFlexOrgManagementDisclosure,
 230              "FlexOrgManagementDisclosure",
 231              base::FEATURE_ENABLED_BY_DEFAULT);
 232 #endif  // BUILDFLAG(IS_CHROMEOS)
 233
 234 // Enables usage of the FedCM API without third party cookies at the same time.
 235 BASE_FEATURE(kFedCmWithoutThirdPartyCookies,
 236              "FedCmWithoutThirdPartyCookies",
 237              base::FEATURE_DISABLED_BY_DEFAULT);
 238
 239 // Enables the Incoming Call Notifications scenario. When created by an
 240 // installed origin, an incoming call notification should have increased
 241 // priority, colored buttons, a ringtone, and a default "close" button.
 242 // Otherwise, if the origin is not installed, it should behave like the default
 243 // notifications, but with the added "Close" button. See
 244 // https://github.com/MicrosoftEdge/MSEdgeExplainers/blob/main/Notifications/notifications_actions_customization.md
 245 BASE_FEATURE(kIncomingCallNotifications,
 246              "IncomingCallNotifications",
 247              base::FEATURE_DISABLED_BY_DEFAULT);
 248
 249 // Enables omnibox trigger prerendering.
 250 BASE_FEATURE(kOmniboxTriggerForPrerender2,
 251              "OmniboxTriggerForPrerender2",
 252              base::FEATURE_ENABLED_BY_DEFAULT);
 253
 254 // Enables bookmark trigger prerendering.
 255 BASE_FEATURE(kBookmarkTriggerForPrerender2,
 256              "BookmarkTriggerForPrerender2",
 257              base::FEATURE_DISABLED_BY_DEFAULT);
 258
 259 // Enables New Tab Page trigger prerendering.
 260 BASE_FEATURE(kNewTabPageTriggerForPrerender2,
 261              "NewTabPageTriggerForPrerender2",
 262              base::FEATURE_DISABLED_BY_DEFAULT);
 263
 264 BASE_FEATURE(kSupportSearchSuggestionForPrerender2,
 265              "SupportSearchSuggestionForPrerender2",
 266              base::FEATURE_DISABLED_BY_DEFAULT);
 267
 268 const base::FeatureParam<SearchPreloadShareableCacheType>::Option
 269     search_preload_shareable_cache_types[] = {
 270         {SearchPreloadShareableCacheType::kEnabled, "enabled"},
 271         {SearchPreloadShareableCacheType::kDisabled, "disabled"}};
 272 const base::FeatureParam<SearchPreloadShareableCacheType>
 273     kSearchPreloadShareableCacheTypeParam{
 274         &kSupportSearchSuggestionForPrerender2, "shareable_cache",
 275         SearchPreloadShareableCacheType::kEnabled,
 276         &search_preload_shareable_cache_types};
 277
 278 BASE_FEATURE(kPrerenderDSEHoldback,
 279              "PrerenderDSEHoldback",
 280              base::FEATURE_DISABLED_BY_DEFAULT);
 281
 282 BASE_FEATURE(kAutocompleteActionPredictorConfidenceCutoff,
 283              "AutocompleteActionPredictorConfidenceCutoff",
 284              base::FEATURE_DISABLED_BY_DEFAULT);
 285
 286 // Enables omnibox trigger no state prefetch. Only one of
 287 // kOmniboxTriggerForPrerender2 or kOmniboxTriggerForNoStatePrefetch can be
 288 // enabled in the experiment. If both are enabled, only
 289 // kOmniboxTriggerForPrerender2 takes effect.
 290 // TODO(crbug.com/1267731): Remove this flag once the experiments are completed.
 291 BASE_FEATURE(kOmniboxTriggerForNoStatePrefetch,
 292              "OmniboxTriggerForNoStatePrefetch",
 293              base::FEATURE_DISABLED_BY_DEFAULT);
 294
 295 #if BUILDFLAG(IS_LINUX) || BUILDFLAG(IS_MAC) || BUILDFLAG(IS_WIN)
 296 BASE_FEATURE(kPayloadTestComponent,
 297              "PayloadTestComponent",
 298              base::FEATURE_DISABLED_BY_DEFAULT);
 299 #endif
 300
 301 }  // namespace features