oobe: Show battery warning on the update screen

Battery warning message is shown after UPDATE_AVAILABLE stage on update
screen iff the battery is DISCHARGING and is lower 50%. In this CL only
placeholder for html part is provided.

Bug: 1101783
Change-Id: I70376a668c1a905e5dbab6cda986f13029e8e71c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2285009
Commit-Queue: Danila Kuzmin <dkuzmin@google.com>
Reviewed-by: Roman Sorokin [CET] <rsorokin@chromium.org>
Reviewed-by: Roman Aleksandrov <raleksandrov@google.com>
Cr-Commit-Position: refs/heads/master@{#791222}

chrome/browser/chromeos/login/screens/mock_update_screen.h

@@ -45,6 +45,7 @@ class MockUpdateView : public UpdateView {
   MOCK_METHOD(void, SetProgress, (int value));
   MOCK_METHOD(void, SetRequiresPermissionForCellular, (bool value));
   MOCK_METHOD(void, SetCancelUpdateShortcutEnabled, (bool value));
+  MOCK_METHOD(void, ShowLowBatteryWarningMessage, (bool value));
 
  private:
   UpdateScreen* screen_ = nullptr;

chrome/browser/chromeos/login/screens/update_screen.cc

@@ -20,6 +20,7 @@
 #include "chrome/browser/chromeos/login/wizard_context.h"
 #include "chrome/browser/chromeos/policy/enrollment_requisition_manager.h"
 #include "chrome/browser/ui/webui/chromeos/login/update_screen_handler.h"
+#include "chromeos/constants/chromeos_features.h"
 #include "chromeos/network/network_state.h"
 
 namespace chromeos {
@@ -44,6 +45,9 @@ constexpr const base::TimeDelta kDelayErrorMessage =
 constexpr const base::TimeDelta kShowDelay =
     base::TimeDelta::FromMicroseconds(400);
 
+// When battery percent is lower and DISCHARGING warn user about it.
+const double kInsufficientBatteryPercent = 50;
+
 void RecordDownloadingTime(base::TimeDelta duration) {
   base::UmaHistogramLongTimes("OOBE.UpdateScreen.UpdateDownloadingTime",
                               duration);
@@ -105,11 +109,15 @@ UpdateScreen::UpdateScreen(UpdateView* view,
           std::make_unique<ErrorScreensHistogramHelper>("Update")),
       version_updater_(std::make_unique<VersionUpdater>(this)),
       tick_clock_(base::DefaultTickClock::GetInstance()) {
+  if (chromeos::features::IsBetterUpdateEnabled())
+    PowerManagerClient::Get()->AddObserver(this);
   if (view_)
     view_->Bind(this);
 }
 
 UpdateScreen::~UpdateScreen() {
+  if (chromeos::features::IsBetterUpdateEnabled())
+    PowerManagerClient::Get()->RemoveObserver(this);
   if (view_)
     view_->Unbind();
 }
@@ -145,6 +153,8 @@ bool UpdateScreen::MaybeSkip(WizardContext* context) {
 }
 
 void UpdateScreen::ShowImpl() {
+  if (chromeos::features::IsBetterUpdateEnabled())
+    PowerManagerClient::Get()->RequestStatusUpdate();
 #if !BUILDFLAG(GOOGLE_CHROME_BRANDING)
   if (view_) {
     view_->SetCancelUpdateShortcutEnabled(true);
@@ -355,6 +365,8 @@ void UpdateScreen::UpdateInfoChanged(
     default:
       NOTREACHED();
   }
+  if (chromeos::features::IsBetterUpdateEnabled())
+    UpdateBatteryWarningVisibility();
   if (need_refresh_view)
     RefreshView(update_info);
 }
@@ -370,6 +382,25 @@ void UpdateScreen::FinishExitUpdate(Result result) {
   exit_callback_.Run(result);
 }
 
+void UpdateScreen::PowerChanged(
+    const power_manager::PowerSupplyProperties& proto) {
+  UpdateBatteryWarningVisibility();
+}
+
+void UpdateScreen::UpdateBatteryWarningVisibility() {
+  if (!view_)
+    return;
+  const base::Optional<power_manager::PowerSupplyProperties>& proto =
+      PowerManagerClient::Get()->GetLastStatus();
+  if (!proto.has_value())
+    return;
+  view_->ShowLowBatteryWarningMessage(
+      is_critical_checked_ && HasCriticalUpdate() &&
+      proto->battery_state() ==
+          power_manager::PowerSupplyProperties_BatteryState_DISCHARGING &&
+      proto->battery_percent() < kInsufficientBatteryPercent);
+}
+
 void UpdateScreen::RefreshView(const VersionUpdater::UpdateInfo& update_info) {
   if (view_) {
     view_->SetProgress(update_info.progress);
@@ -386,6 +417,9 @@ void UpdateScreen::RefreshView(const VersionUpdater::UpdateInfo& update_info) {
 bool UpdateScreen::HasCriticalUpdate() {
   if (ignore_update_deadlines_)
     return true;
+  if (has_critical_update_.has_value())
+    return has_critical_update_.value();
+  has_critical_update_ = true;
 
   std::string deadline;
   // Checking for update flag file causes us to do blocking IO on UI thread.
@@ -394,6 +428,7 @@ bool UpdateScreen::HasCriticalUpdate() {
   base::FilePath update_deadline_file_path(kUpdateDeadlineFile);
   if (!base::ReadFileToString(update_deadline_file_path, &deadline) ||
       deadline.empty()) {
+    has_critical_update_ = false;
     return false;
   }
 

chrome/browser/chromeos/login/screens/update_screen.h

@@ -16,6 +16,7 @@
 #include "chrome/browser/chromeos/login/screens/base_screen.h"
 #include "chrome/browser/chromeos/login/screens/error_screen.h"
 #include "chrome/browser/chromeos/login/version_updater/version_updater.h"
+#include "chromeos/dbus/power/power_manager_client.h"
 
 namespace base {
 class TickClock;
@@ -54,7 +55,9 @@ class WizardContext;
 // has network connectivity - if the current network is not online (e.g. behind
 // a protal), it will request an ErrorScreen to be shown. Update check will be
 // delayed until the Internet connectivity is established.
-class UpdateScreen : public BaseScreen, public VersionUpdater::Delegate {
+class UpdateScreen : public BaseScreen,
+                     public VersionUpdater::Delegate,
+                     public PowerManagerClient::Observer {
  public:
   using Result = VersionUpdater::Result;
 
@@ -93,6 +96,9 @@ class UpdateScreen : public BaseScreen, public VersionUpdater::Delegate {
       const VersionUpdater::UpdateInfo& update_info) override;
   void FinishExitUpdate(VersionUpdater::Result result) override;
 
+  // PowerManagerClient::Observer:
+  void PowerChanged(const power_manager::PowerSupplyProperties& proto) override;
+
   void set_exit_callback_for_testing(ScreenExitCallback exit_callback) {
     exit_callback_ = exit_callback;
   }
@@ -134,6 +140,10 @@ class UpdateScreen : public BaseScreen, public VersionUpdater::Delegate {
   // screen gets hidden.
   void OnErrorScreenHidden();
 
+  // Updates visibility of the low battery warning message during the update
+  // stages. Called when power or update status changes.
+  void UpdateBatteryWarningVisibility();
+
   UpdateView* view_;
   ErrorScreen* error_screen_;
   ScreenExitCallback exit_callback_;
@@ -151,6 +161,9 @@ class UpdateScreen : public BaseScreen, public VersionUpdater::Delegate {
   // True if already checked that update is critical.
   bool is_critical_checked_ = false;
 
+  // Caches the result of HasCriticalUpdate function.
+  base::Optional<bool> has_critical_update_;
+
   // True if the update progress should be hidden even if update_info suggests
   // the opposite.
   bool hide_progress_on_exit_ = false;

chrome/browser/chromeos/login/screens/update_screen_browsertest.cc

@@ -11,6 +11,7 @@
 #include "base/optional.h"
 #include "base/run_loop.h"
 #include "base/strings/string_util.h"
+#include "base/test/scoped_feature_list.h"
 #include "base/test/simple_test_tick_clock.h"
 #include "base/time/time.h"
 #include "chrome/browser/chromeos/login/login_wizard.h"
@@ -28,8 +29,10 @@
 #include "chrome/browser/ui/webui/chromeos/login/update_screen_handler.h"
 #include "chrome/grit/chromium_strings.h"
 #include "chrome/grit/generated_resources.h"
+#include "chromeos/constants/chromeos_features.h"
 #include "chromeos/dbus/dbus_thread_manager.h"
 #include "chromeos/dbus/fake_update_engine_client.h"
+#include "chromeos/dbus/power/fake_power_manager_client.h"
 #include "chromeos/network/network_connection_handler.h"
 #include "chromeos/network/network_handler.h"
 #include "content/public/test/browser_test.h"
@@ -59,6 +62,8 @@ const test::UIPath kCellularPermissionNext = {"oobe-update",
                                               "cellular-permission-next"};
 const test::UIPath kCellularPermissionBack = {"oobe-update",
                                               "cellular-permission-back"};
+const test::UIPath kLowBatteryWarningMessage = {"oobe-update",
+                                                "battery-warning"};
 const test::UIPath kErrorMessage = {"error-message"};
 
 // UMA names for better test reading.
@@ -168,6 +173,23 @@ class UpdateScreenTest : public OobeBaseTest {
   DISALLOW_COPY_AND_ASSIGN(UpdateScreenTest);
 };
 
+class BetterUpdateScreenTest : public UpdateScreenTest {
+ public:
+  BetterUpdateScreenTest() {
+    feature_list_.InitWithFeatures({chromeos::features::kBetterUpdateScreen},
+                                   {});
+  }
+  ~BetterUpdateScreenTest() override = default;
+
+ protected:
+  chromeos::FakePowerManagerClient* power_manager_client() {
+    return chromeos::FakePowerManagerClient::Get();
+  }
+
+ private:
+  base::test::ScopedFeatureList feature_list_;
+};
+
 void UpdateScreenTest::CheckPathVisiblity(
     std::initializer_list<base::StringPiece> element_ids,
     bool visibility) {
@@ -729,4 +751,137 @@ IN_PROC_BROWSER_TEST_F(UpdateScreenTest, UpdateOverCellularRejected) {
   histogram_tester_.ExpectTotalCount(kTimeFinalize, 0);
 }
 
+IN_PROC_BROWSER_TEST_F(BetterUpdateScreenTest, TestInitialLowBatteryStatus) {
+  update_screen_->set_ignore_update_deadlines_for_testing(true);
+  // Set low battery and discharging status before oobe-update screen is shown.
+  power_manager::PowerSupplyProperties props;
+  props.set_battery_percent(49);
+  props.set_battery_state(
+      power_manager::PowerSupplyProperties_BatteryState_DISCHARGING);
+  power_manager_client()->UpdatePowerProperties(props);
+
+  ShowUpdateScreen();
+  EXPECT_TRUE(power_manager_client()->HasObserver(update_screen_));
+  test::OobeJS().ExpectHiddenPath(kLowBatteryWarningMessage);
+
+  update_engine::StatusResult status;
+  status.set_current_operation(update_engine::Operation::DOWNLOADING);
+  status.set_new_version("latest and greatest");
+  status.set_new_size(1'000'000'000);
+  status.set_progress(0.0);
+  update_engine_client()->set_default_status(status);
+  update_engine_client()->NotifyObserversThatStatusChanged(status);
+
+  // Warning message is shown while not charging and battery is low.
+  test::OobeJS().ExpectVisiblePath(kLowBatteryWarningMessage);
+}
+
+IN_PROC_BROWSER_TEST_F(BetterUpdateScreenTest,
+                       TestBatteryWarningDuringUpdateStages) {
+  update_screen_->set_ignore_update_deadlines_for_testing(true);
+  ShowUpdateScreen();
+  EXPECT_TRUE(power_manager_client()->HasObserver(update_screen_));
+
+  power_manager::PowerSupplyProperties props;
+  props.set_battery_percent(49);
+  props.set_battery_state(
+      power_manager::PowerSupplyProperties_BatteryState_DISCHARGING);
+  power_manager_client()->UpdatePowerProperties(props);
+
+  test::OobeJS().ExpectHiddenPath(kLowBatteryWarningMessage);
+
+  update_engine::StatusResult status;
+  // Warning message is hidden before DOWNLOADING stage.
+  status.set_current_operation(update_engine::Operation::CHECKING_FOR_UPDATE);
+  update_engine_client()->set_default_status(status);
+  update_engine_client()->NotifyObserversThatStatusChanged(status);
+
+  test::OobeJS().ExpectHiddenPath(kLowBatteryWarningMessage);
+
+  status.set_current_operation(update_engine::Operation::UPDATE_AVAILABLE);
+  update_engine_client()->set_default_status(status);
+  update_engine_client()->NotifyObserversThatStatusChanged(status);
+
+  test::OobeJS().ExpectHiddenPath(kLowBatteryWarningMessage);
+
+  status.set_current_operation(update_engine::Operation::DOWNLOADING);
+  status.set_new_version("latest and greatest");
+  status.set_new_size(1'000'000'000);
+  status.set_progress(0.0);
+  update_engine_client()->set_default_status(status);
+  update_engine_client()->NotifyObserversThatStatusChanged(status);
+
+  test::OobeJS().ExpectVisiblePath(kLowBatteryWarningMessage);
+
+  // Warning message remains on the screen during next update stages, iff the
+  // battery is low and discharging.
+  status.set_current_operation(update_engine::Operation::VERIFYING);
+  status.set_progress(1.0);
+  update_engine_client()->set_default_status(status);
+  update_engine_client()->NotifyObserversThatStatusChanged(status);
+
+  test::OobeJS().ExpectVisiblePath(kLowBatteryWarningMessage);
+
+  status.set_current_operation(update_engine::Operation::FINALIZING);
+  update_engine_client()->set_default_status(status);
+  update_engine_client()->NotifyObserversThatStatusChanged(status);
+
+  test::OobeJS().ExpectVisiblePath(kLowBatteryWarningMessage);
+
+  status.set_current_operation(update_engine::Operation::UPDATED_NEED_REBOOT);
+  update_engine_client()->set_default_status(status);
+  update_engine_client()->NotifyObserversThatStatusChanged(status);
+
+  // UpdateStatusChanged(status) calls RebootAfterUpdate().
+  EXPECT_EQ(update_engine_client()->reboot_after_update_call_count(), 1);
+  test::OobeJS().ExpectVisiblePath(kLowBatteryWarningMessage);
+}
+
+IN_PROC_BROWSER_TEST_F(BetterUpdateScreenTest,
+                       TestBatteryWarningOnDifferentBatteryStatus) {
+  update_screen_->set_ignore_update_deadlines_for_testing(true);
+  ShowUpdateScreen();
+  EXPECT_TRUE(power_manager_client()->HasObserver(update_screen_));
+
+  update_engine::StatusResult status;
+  status.set_current_operation(update_engine::Operation::DOWNLOADING);
+  status.set_new_version("latest and greatest");
+  status.set_new_size(1'000'000'000);
+  status.set_progress(0.0);
+  update_engine_client()->set_default_status(status);
+  update_engine_client()->NotifyObserversThatStatusChanged(status);
+
+  power_manager::PowerSupplyProperties props;
+
+  // Warning message is hidden while not charging, but enough battery.
+  props.set_battery_percent(100);
+  props.set_battery_state(
+      power_manager::PowerSupplyProperties_BatteryState_FULL);
+  power_manager_client()->UpdatePowerProperties(props);
+
+  test::OobeJS().ExpectVisible("oobe-update");
+  test::OobeJS().ExpectHiddenPath(kLowBatteryWarningMessage);
+
+  props.set_battery_percent(85);
+  props.set_battery_state(
+      power_manager::PowerSupplyProperties_BatteryState_DISCHARGING);
+  power_manager_client()->UpdatePowerProperties(props);
+
+  test::OobeJS().ExpectHiddenPath(kLowBatteryWarningMessage);
+
+  // Warning message is shown while not charging and battery is low.
+  props.set_battery_percent(48);
+  power_manager_client()->UpdatePowerProperties(props);
+
+  test::OobeJS().ExpectVisiblePath(kLowBatteryWarningMessage);
+
+  // Warning message is hidden while charging.
+  props.set_battery_percent(49);
+  props.set_battery_state(
+      power_manager::PowerSupplyProperties_BatteryState_CHARGING);
+  power_manager_client()->UpdatePowerProperties(props);
+
+  test::OobeJS().ExpectHiddenPath(kLowBatteryWarningMessage);
+}
+
 }  // namespace chromeos

chrome/browser/resources/chromeos/login/oobe_update.html

@@ -10,42 +10,51 @@
   <template>
     <style include="oobe-dialog-host"></style>
     <link rel="stylesheet" href="oobe_update.css">
-    <checking-downloading-update id="checking-downloading-update"
-        aria-label$="[[i18nDynamic(locale, 'updateScreenAccessibleTitle')]]"
-        hidden="[[requiresPermissionForCellular]]"
-        checking-for-update="[[checkingForUpdate]]"
-        cancel-allowed="[[cancelAllowed]]"
-        update-completed="[[updateCompleted]]"
-        progress-value="[[progressValue]]"
-        has-estimate="[[estimatedTimeLeftShown]]"
-        estimated-time-left="[[estimatedTimeLeft]]"
-        default-progress-message="[[progressMessage]]"
-        checking-for-updates-key="checkingForUpdatesMsg"
-        cancel-hint-key="[[cancelHint]]"
-        downloading-updates-key="installingUpdateDesc">
-    </checking-downloading-update>
-    <oobe-dialog hidden="[[!requiresPermissionForCellular]]" tabindex="0"
-        subtitle-key="updateOverCellularPromptMessage"
-        aria-live="polite" has-buttons footer-shrinkable
-        id="cellular-permission-dialog">
-      <hd-iron-icon slot="oobe-icon"
-          icon1x="oobe-32:googleg" icon2x="oobe-64:googleg">
-      </hd-iron-icon>
-      <h1 slot="title">
-        [[i18nRecursive(locale, 'updateOverCellularPromptTitle',
-                        'productName')]]
-      </h1>
-      <div slot="footer" class="flex layout vertical center-justified center">
-        <img class="update-illustration oobe-illustration"
-            srcset="images/1x/updating_1x.svg 1x,
-                    images/2x/updating_2x.svg 2x">
-      </div>
-      <div slot="bottom-buttons" class="layout horizontal justified">
-        <oobe-back-button id="cellular-permission-back" inverse
-            on-click="onBackClicked_"></oobe-back-button>
-        <oobe-next-button id="cellular-permission-next" inverse
-            on-tap="onNextClicked_"></oobe-next-button>
-      </div>
-    </oobe-dialog>
+    <div hidden="[[betterUpdateScreenFeatureEnabled_]]">
+      <checking-downloading-update id="checking-downloading-update"
+          aria-label$="[[i18nDynamic(locale, 'updateScreenAccessibleTitle')]]"
+          hidden="[[requiresPermissionForCellular]]"
+          checking-for-update="[[checkingForUpdate]]"
+          cancel-allowed="[[cancelAllowed]]"
+          update-completed="[[updateCompleted]]"
+          progress-value="[[progressValue]]"
+          has-estimate="[[estimatedTimeLeftShown]]"
+          estimated-time-left="[[estimatedTimeLeft]]"
+          default-progress-message="[[progressMessage]]"
+          checking-for-updates-key="checkingForUpdatesMsg"
+          cancel-hint-key="[[cancelHint]]"
+          downloading-updates-key="installingUpdateDesc">
+      </checking-downloading-update>
+      <oobe-dialog hidden="[[!requiresPermissionForCellular]]" tabindex="0"
+          subtitle-key="updateOverCellularPromptMessage"
+          aria-live="polite" has-buttons footer-shrinkable
+          id="cellular-permission-dialog">
+        <hd-iron-icon slot="oobe-icon"
+            icon1x="oobe-32:googleg" icon2x="oobe-64:googleg">
+        </hd-iron-icon>
+        <h1 slot="title">
+          [[i18nRecursive(locale, 'updateOverCellularPromptTitle',
+                          'productName')]]
+        </h1>
+        <div slot="footer" class="flex layout vertical center-justified center">
+          <img class="update-illustration oobe-illustration"
+              srcset="images/1x/updating_1x.svg 1x,
+                      images/2x/updating_2x.svg 2x">
+        </div>
+        <div slot="bottom-buttons" class="layout horizontal justified">
+          <oobe-back-button id="cellular-permission-back" inverse
+              on-click="onBackClicked_"></oobe-back-button>
+          <oobe-next-button id="cellular-permission-next" inverse
+              on-tap="onNextClicked_"></oobe-next-button>
+        </div>
+      </oobe-dialog>
+    </div>
+    <div hidden="[[!betterUpdateScreenFeatureEnabled_]]">
+      <oobe-dialog>
+        <div hidden="[[!showLowBatteryWarning]]" id="battery-warning"
+            slot="footer">
+        </div>
+      </oobe-dialog>
+    </div>
   </template>
 </dom-module>

chrome/browser/resources/chromeos/login/oobe_update.js

@@ -28,9 +28,22 @@ Polymer({
     'setUpdateProgress',
     'setRequiresPermissionForCellular',
     'setCancelUpdateShortcutEnabled',
+    'showLowBatteryWarningMessage',
   ],
 
   properties: {
+    /**
+     * Shows better update screen instead of the old one. True when
+     * kBetterUpdateScreen feature flag is enabled.
+     */
+    betterUpdateScreenFeatureEnabled_: {
+      type: Boolean,
+      value() {
+        return loadTimeData.getBoolean('betterUpdateScreenFeatureEnabled');
+      },
+      readOnly: true,
+    },
+
     /**
      * Shows "Checking for update ..." section and hides "Updating..." section.
      */
@@ -102,6 +115,14 @@ Polymer({
       type: String,
       value: 'cancelUpdateHint',
     },
+
+    /**
+     * Shows battery warning message during Downloading stage.
+     */
+    showLowBatteryWarning: {
+      type: Boolean,
+      value: false,
+    },
   },
 
   ready() {
@@ -196,5 +217,13 @@ Polymer({
     this.checkingForUpdate = visible;
   },
 
+  /**
+   * Shows or hides battery warning message.
+   * @param {boolean} visible Is message visible?
+   */
+  showLowBatteryWarningMessage(visible) {
+    this.showLowBatteryWarning = visible;
+  },
+
 });
 })();

chrome/browser/ui/webui/chromeos/login/update_screen_handler.cc

@@ -12,6 +12,7 @@
 #include "chrome/browser/chromeos/login/screens/update_screen.h"
 #include "chrome/grit/chromium_strings.h"
 #include "chrome/grit/generated_resources.h"
+#include "chromeos/constants/chromeos_features.h"
 #include "components/login/localized_values_builder.h"
 #include "ui/chromeos/devicetype_utils.h"
 
@@ -81,6 +82,10 @@ void UpdateScreenHandler::SetCancelUpdateShortcutEnabled(bool value) {
   CallJS("login.UpdateScreen.setCancelUpdateShortcutEnabled", value);
 }
 
+void UpdateScreenHandler::ShowLowBatteryWarningMessage(bool value) {
+  CallJS("login.UpdateScreen.showLowBatteryWarningMessage", value);
+}
+
 void UpdateScreenHandler::DeclareLocalizedValues(
     ::login::LocalizedValuesBuilder* builder) {
   builder->Add("checkingForUpdatesMsg", IDS_CHECKING_FOR_UPDATE_MSG);
@@ -115,6 +120,12 @@ void UpdateScreenHandler::DeclareLocalizedValues(
   builder->Add("updatingScreenTitle", IDS_UPDATING_SCREEN_TITLE);
 }
 
+void UpdateScreenHandler::GetAdditionalParameters(base::DictionaryValue* dict) {
+  dict->SetBoolKey("betterUpdateScreenFeatureEnabled",
+                   chromeos::features::IsBetterUpdateEnabled());
+  BaseScreenHandler::GetAdditionalParameters(dict);
+}
+
 void UpdateScreenHandler::Initialize() {
   if (show_on_init_) {
     Show();

chrome/browser/ui/webui/chromeos/login/update_screen_handler.h

@@ -44,6 +44,7 @@ class UpdateView {
   virtual void SetProgress(int value) = 0;
   virtual void SetRequiresPermissionForCellular(bool value) = 0;
   virtual void SetCancelUpdateShortcutEnabled(bool value) = 0;
+  virtual void ShowLowBatteryWarningMessage(bool value) = 0;
 };
 
 class UpdateScreenHandler : public UpdateView, public BaseScreenHandler {
@@ -67,10 +68,12 @@ class UpdateScreenHandler : public UpdateView, public BaseScreenHandler {
   void SetProgress(int value) override;
   void SetRequiresPermissionForCellular(bool value) override;
   void SetCancelUpdateShortcutEnabled(bool value) override;
+  void ShowLowBatteryWarningMessage(bool value) override;
 
   // BaseScreenHandler:
   void DeclareLocalizedValues(
       ::login::LocalizedValuesBuilder* builder) override;
+  void GetAdditionalParameters(base::DictionaryValue* dict) override;
   void Initialize() override;
 
   UpdateScreen* screen_ = nullptr;

chromeos/constants/chromeos_features.cc

@@ -56,6 +56,13 @@ const base::Feature kAssistPersonalInfo{"AssistPersonalInfo",
 extern const base::Feature kAvatarToolbarButton{
     "AvatarToolbarButton", base::FEATURE_DISABLED_BY_DEFAULT};
 
+// Enables better version of the UpdateScreen in OOBE. Displays low battery
+// warnings during the update downloading and further stages. Provides time
+// estimates of the update stages.
+// https://crbug.com/1101317
+const base::Feature kBetterUpdateScreen{"BetterUpdateScreen",
+                                        base::FEATURE_DISABLED_BY_DEFAULT};
+
 // Enables or disables more aggressive filtering out of Bluetooth devices with
 // "appearances" that are less likely to be pairable or useful.
 const base::Feature kBluetoothAggressiveAppearanceFilter{
@@ -504,6 +511,10 @@ bool IsAmbientModeEnabled() {
   return base::FeatureList::IsEnabled(kAmbientModeFeature);
 }
 
+bool IsBetterUpdateEnabled() {
+  return base::FeatureList::IsEnabled(kBetterUpdateScreen);
+}
+
 bool IsDeepLinkingEnabled() {
   return base::FeatureList::IsEnabled(kOsSettingsDeepLinking);
 }

chromeos/constants/chromeos_features.h

@@ -34,6 +34,8 @@ extern const base::Feature kAssistPersonalInfo;
 COMPONENT_EXPORT(CHROMEOS_CONSTANTS)
 extern const base::Feature kAvatarToolbarButton;
 COMPONENT_EXPORT(CHROMEOS_CONSTANTS)
+extern const base::Feature kBetterUpdateScreen;
+COMPONENT_EXPORT(CHROMEOS_CONSTANTS)
 extern const base::Feature kBluetoothAggressiveAppearanceFilter;
 COMPONENT_EXPORT(CHROMEOS_CONSTANTS)
 extern const base::Feature kBluetoothFixA2dpPacketSize;
@@ -220,6 +222,7 @@ extern const base::Feature kImeMozcProto;
 
 COMPONENT_EXPORT(CHROMEOS_CONSTANTS) bool IsAmbientModeEnabled();
 COMPONENT_EXPORT(CHROMEOS_CONSTANTS) bool IsAssistantEnabled();
+COMPONENT_EXPORT(CHROMEOS_CONSTANTS) bool IsBetterUpdateEnabled();
 COMPONENT_EXPORT(CHROMEOS_CONSTANTS) bool IsDeepLinkingEnabled();
 COMPONENT_EXPORT(CHROMEOS_CONSTANTS) bool IsEduCoexistenceEnabled();
 COMPONENT_EXPORT(CHROMEOS_CONSTANTS) bool IsImeSandboxEnabled();