ash: Remove old lock animation implementation.

ash/wm/lock_state_controller.cc

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "ash/wm/lock_state_controller.h"
 
 #include "ash/ash_switches.h"
+#include "ash/cancel_mode.h"
 #include "ash/shell.h"
 #include "ash/shell_delegate.h"
 #include "ash/shell_window_ids.h"
 #include "ash/wm/session_state_animator.h"
+#include "base/bind_helpers.h"
 #include "base/command_line.h"
+#include "base/timer/timer.h"
 #include "ui/aura/root_window.h"
+#include "ui/compositor/layer_animation_sequence.h"
+#include "ui/compositor/scoped_layer_animation_settings.h"
 #include "ui/views/corewm/compound_event_filter.h"
 
+#if defined(OS_CHROMEOS)
+#include "base/sys_info.h"
+#endif
+
 namespace ash {
 
+namespace {
+
+aura::Window* GetBackground() {
+  aura::RootWindow* root_window = Shell::GetPrimaryRootWindow();
+  return Shell::GetContainer(root_window,
+      internal::kShellWindowId_DesktopBackgroundContainer);
+}
+
+bool IsBackgroundHidden() {
+  return !GetBackground()->IsVisible();
+}
+
+void ShowBackground() {
+  ui::ScopedLayerAnimationSettings settings(
+      GetBackground()->layer()->GetAnimator());
+  settings.SetTransitionDuration(base::TimeDelta());
+  GetBackground()->Show();
+}
+
+void HideBackground() {
+  ui::ScopedLayerAnimationSettings settings(
+      GetBackground()->layer()->GetAnimator());
+  settings.SetTransitionDuration(base::TimeDelta());
+  GetBackground()->Hide();
+}
+
+// This observer is intended to use in cases when some action has to be taken
+// once some animation successfully completes (i.e. it was not aborted).
+// Observer will count a number of sequences it is attached to, and a number of
+// finished sequences (either Ended or Aborted). Once these two numbers are
+// equal, observer will delete itself, calling callback passed to constructor if
+// there were no aborted animations.
+// This way it can be either used to wait for some animation to be finished in
+// multiple layers, to wait once a sequence of animations is finished in one
+// layer or the mixture of both.
+class AnimationFinishedObserver : public ui::LayerAnimationObserver {
+ public:
+  explicit AnimationFinishedObserver(base::Closure &callback)
+      : callback_(callback),
+        sequences_attached_(0),
+        sequences_completed_(0),
+        paused_(false) {
+  }
+
+  // Pauses observer: no checks will be made while paused. It can be used when
+  // a sequence has some immediate animations in the beginning, and for
+  // animations that can be tested with flag that makes all animations
+  // immediate.
+  void Pause() {
+    paused_ = true;
+  }
+
+  // Unpauses observer. It does a check and calls callback if conditions are
+  // met.
+  void Unpause() {
+    if (!paused_)
+      return;
+    paused_ = false;
+    if (sequences_completed_ == sequences_attached_) {
+      callback_.Run();
+      delete this;
+    }
+  }
+
+ private:
+  virtual ~AnimationFinishedObserver() {
+  }
+
+  // LayerAnimationObserver implementation
+  virtual void OnLayerAnimationEnded(
+      ui::LayerAnimationSequence* sequence) OVERRIDE {
+    sequences_completed_++;
+    if ((sequences_completed_ == sequences_attached_) && !paused_) {
+      callback_.Run();
+      delete this;
+    }
+  }
+
+  virtual void OnLayerAnimationAborted(
+      ui::LayerAnimationSequence* sequence) OVERRIDE {
+    sequences_completed_++;
+    if ((sequences_completed_ == sequences_attached_) && !paused_)
+      delete this;
+  }
+
+  virtual void OnLayerAnimationScheduled(
+      ui::LayerAnimationSequence* sequence) OVERRIDE {
+  }
+
+  virtual void OnAttachedToSequence(
+      ui::LayerAnimationSequence* sequence) OVERRIDE {
+    LayerAnimationObserver::OnAttachedToSequence(sequence);
+    sequences_attached_++;
+  }
+
+  // Callback to be called.
+  base::Closure callback_;
+
+  // Number of sequences this observer was attached to.
+  int sequences_attached_;
+
+  // Number of sequences either ended or aborted.
+  int sequences_completed_;
+
+  bool paused_;
+
+  DISALLOW_COPY_AND_ASSIGN(AnimationFinishedObserver);
+};
+
+}  // namespace
+
 const int LockStateController::kLockTimeoutMs = 400;
 const int LockStateController::kShutdownTimeoutMs = 400;
 const int LockStateController::kLockFailTimeoutMs = 8000;
 const int LockStateController::kLockToShutdownTimeoutMs = 150;
 const int LockStateController::kShutdownRequestDelayMs = 50;
 
+LockStateController::TestApi::TestApi(LockStateController* controller)
+    : controller_(controller) {
+}
+
+LockStateController::TestApi::~TestApi() {
+}
+
 LockStateController::LockStateController()
-    : animator_(new internal::SessionStateAnimator()) {
+    : animator_(new internal::SessionStateAnimator()),
+      login_status_(user::LOGGED_IN_NONE),
+      system_is_locked_(false),
+      shutting_down_(false),
+      shutdown_after_lock_(false),
+      animating_lock_(false),
+      can_cancel_lock_animation_(false) {
+  Shell::GetPrimaryRootWindow()->AddRootWindowObserver(this);
 }
 
 LockStateController::~LockStateController() {
+  Shell::GetPrimaryRootWindow()->RemoveRootWindowObserver(this);
 }
 
 void LockStateController::SetDelegate(LockStateControllerDelegate* delegate) {
   delegate_.reset(delegate);
 }
 
 void LockStateController::AddObserver(LockStateObserver* observer) {
   observers_.AddObserver(observer);
 }
 
 void LockStateController::RemoveObserver(LockStateObserver* observer) {
   observers_.RemoveObserver(observer);
 }
 
 bool LockStateController::HasObserver(LockStateObserver* observer) {
   return observers_.HasObserver(observer);
 }
 
+void LockStateController::StartLockAnimation(
+    bool shutdown_after_lock) {
+  if (animating_lock_)
+    return;
+  shutdown_after_lock_ = shutdown_after_lock;
+  can_cancel_lock_animation_ = true;
+
+  StartCancellablePreLockAnimation();
+}
+
+void LockStateController::StartShutdownAnimation() {
+  StartCancellableShutdownAnimation();
+}
+
+void LockStateController::StartLockAnimationAndLockImmediately() {
+  if (animating_lock_)
+    return;
+  StartImmediatePreLockAnimation(true /* request_lock_on_completion */);
+}
+
+bool LockStateController::LockRequested() {
+  return lock_fail_timer_.IsRunning();
+}
+
+bool LockStateController::ShutdownRequested() {
+  return shutting_down_;
+}
+
+bool LockStateController::CanCancelLockAnimation() {
+  return can_cancel_lock_animation_;
+}
+
+void LockStateController::CancelLockAnimation() {
+  if (!CanCancelLockAnimation())
+    return;
+  shutdown_after_lock_ = false;
+  animating_lock_ = false;
+  CancelPreLockAnimation();
+}
+
+bool LockStateController::CanCancelShutdownAnimation() {
+  return pre_shutdown_timer_.IsRunning() ||
+         shutdown_after_lock_ ||
+         lock_to_shutdown_timer_.IsRunning();
+}
+
+void LockStateController::CancelShutdownAnimation() {
+  if (!CanCancelShutdownAnimation())
+    return;
+  if (lock_to_shutdown_timer_.IsRunning()) {
+    lock_to_shutdown_timer_.Stop();
+    return;
+  }
+  if (shutdown_after_lock_) {
+    shutdown_after_lock_ = false;
+    return;
+  }
+
+  animator_->StartGlobalAnimation(
+      internal::SessionStateAnimator::ANIMATION_UNDO_GRAYSCALE_BRIGHTNESS,
+      internal::SessionStateAnimator::ANIMATION_SPEED_REVERT_SHUTDOWN);
+  pre_shutdown_timer_.Stop();
+}
+
+void LockStateController::OnStartingLock() {
+  if (shutting_down_ || system_is_locked_)
+    return;
+  if (animating_lock_)
+    return;
+  StartImmediatePreLockAnimation(false /* request_lock_on_completion */);
+}
+
+void LockStateController::RequestShutdown() {
+  if (shutting_down_)
+    return;
+
+  shutting_down_ = true;
+
+  Shell* shell = ash::Shell::GetInstance();
+  shell->env_filter()->set_cursor_hidden_by_filter(false);
+  shell->cursor_manager()->HideCursor();
+
+  animator_->StartGlobalAnimation(
+      internal::SessionStateAnimator::ANIMATION_GRAYSCALE_BRIGHTNESS,
+      internal::SessionStateAnimator::ANIMATION_SPEED_SHUTDOWN);
+  StartRealShutdownTimer(true);
+}
+
+void LockStateController::OnLockScreenHide(
+  base::Callback<void(void)>& callback) {
+  StartUnlockAnimationBeforeUIDestroyed(callback);
+}
+
+void LockStateController::SetLockScreenDisplayedCallback(
+    base::Closure& callback) {
+  lock_screen_displayed_callback_ = callback;
+}
+
+void LockStateController::OnRootWindowHostCloseRequested(
+                                                const aura::RootWindow*) {
+  Shell::GetInstance()->delegate()->Exit();
+}
+
+void LockStateController::OnLoginStateChanged(
+    user::LoginStatus status) {
+  if (status != user::LOGGED_IN_LOCKED)
+    login_status_ = status;
+  system_is_locked_ = (status == user::LOGGED_IN_LOCKED);
+}
+
+void LockStateController::OnAppTerminating() {
+  // If we hear that Chrome is exiting but didn't request it ourselves, all we
+  // can really hope for is that we'll have time to clear the screen.
+  // This is also the case when the user signs off.
+  if (!shutting_down_) {
+    shutting_down_ = true;
+    Shell* shell = ash::Shell::GetInstance();
+    shell->env_filter()->set_cursor_hidden_by_filter(false);
+    shell->cursor_manager()->HideCursor();
+    animator_->StartAnimation(
+        internal::SessionStateAnimator::kAllContainersMask,
+        internal::SessionStateAnimator::ANIMATION_HIDE_IMMEDIATELY,
+        internal::SessionStateAnimator::ANIMATION_SPEED_IMMEDIATE);
+  }
+}
+
+void LockStateController::OnLockStateChanged(bool locked) {
+  if (shutting_down_ || (system_is_locked_ == locked))
+    return;
+
+  system_is_locked_ = locked;
+
+  if (locked) {
+    StartPostLockAnimation();
+    lock_fail_timer_.Stop();
+  } else {
+    StartUnlockAnimationAfterUIDestroyed();
+  }
+}
+
+void LockStateController::OnLockFailTimeout() {
+  DCHECK(!system_is_locked_);
+  // Undo lock animation.
+  StartUnlockAnimationAfterUIDestroyed();
+}
+
+void LockStateController::StartLockToShutdownTimer() {
+  shutdown_after_lock_ = false;
+  lock_to_shutdown_timer_.Stop();
+  lock_to_shutdown_timer_.Start(
+      FROM_HERE,
+      base::TimeDelta::FromMilliseconds(kLockToShutdownTimeoutMs),
+      this, &LockStateController::OnLockToShutdownTimeout);
+}
+
+void LockStateController::OnLockToShutdownTimeout() {
+  DCHECK(system_is_locked_);
+  StartCancellableShutdownAnimation();
+}
+
+void LockStateController::StartPreShutdownAnimationTimer() {
+  pre_shutdown_timer_.Stop();
+  pre_shutdown_timer_.Start(
+      FROM_HERE,
+      animator_->
+          GetDuration(internal::SessionStateAnimator::ANIMATION_SPEED_SHUTDOWN),
+      this,
+      &LockStateController::OnPreShutdownAnimationTimeout);
+}
+
+void LockStateController::OnPreShutdownAnimationTimeout() {
+  shutting_down_ = true;
+
+  Shell* shell = ash::Shell::GetInstance();
+  shell->env_filter()->set_cursor_hidden_by_filter(false);
+  shell->cursor_manager()->HideCursor();
+
+  StartRealShutdownTimer(false);
+}
+
+void LockStateController::StartRealShutdownTimer(
+    bool with_animation_time) {
+  base::TimeDelta duration =
+      base::TimeDelta::FromMilliseconds(kShutdownRequestDelayMs);
+  if (with_animation_time) {
+    duration += animator_->GetDuration(
+        internal::SessionStateAnimator::ANIMATION_SPEED_SHUTDOWN);
+  }
+  real_shutdown_timer_.Start(
+      FROM_HERE,
+      duration,
+      this,
+      &LockStateController::OnRealShutdownTimeout);
+}
+
+void LockStateController::OnRealShutdownTimeout() {
+  DCHECK(shutting_down_);
+#if defined(OS_CHROMEOS)
+  if (!base::SysInfo::IsRunningOnChromeOS()) {
+    ShellDelegate* delegate = Shell::GetInstance()->delegate();
+    if (delegate) {
+      delegate->Exit();
+      return;
+    }
+  }
+#endif
+  Shell::GetInstance()->delegate()->RecordUserMetricsAction(
+      UMA_ACCEL_SHUT_DOWN_POWER_BUTTON);
+  delegate_->RequestShutdown();
+}
+
+void LockStateController::StartCancellableShutdownAnimation() {
+  Shell* shell = ash::Shell::GetInstance();
+  // Hide cursor, but let it reappear if the mouse moves.
+  shell->env_filter()->set_cursor_hidden_by_filter(true);
+  shell->cursor_manager()->HideCursor();
+
+  animator_->StartGlobalAnimation(
+      internal::SessionStateAnimator::ANIMATION_GRAYSCALE_BRIGHTNESS,
+      internal::SessionStateAnimator::ANIMATION_SPEED_SHUTDOWN);
+  StartPreShutdownAnimationTimer();
+}
+
+void LockStateController::StartImmediatePreLockAnimation(
+    bool request_lock_on_completion) {
+  animating_lock_ = true;
+
+  StoreUnlockedProperties();
+
+  base::Closure next_animation_starter =
+      base::Bind(&LockStateController::PreLockAnimationFinished,
+      base::Unretained(this), request_lock_on_completion);
+  AnimationFinishedObserver* observer =
+      new AnimationFinishedObserver(next_animation_starter);
+
+  observer->Pause();
+
+  animator_->StartAnimationWithObserver(
+      internal::SessionStateAnimator::NON_LOCK_SCREEN_CONTAINERS,
+      internal::SessionStateAnimator::ANIMATION_LIFT,
+      internal::SessionStateAnimator::ANIMATION_SPEED_MOVE_WINDOWS,
+      observer);
+  animator_->StartAnimationWithObserver(
+      internal::SessionStateAnimator::LAUNCHER,
+      internal::SessionStateAnimator::ANIMATION_FADE_OUT,
+      internal::SessionStateAnimator::ANIMATION_SPEED_MOVE_WINDOWS,
+      observer);
+  // Hide the screen locker containers so we can raise them later.
+  animator_->StartAnimation(
+      internal::SessionStateAnimator::LOCK_SCREEN_CONTAINERS,
+      internal::SessionStateAnimator::ANIMATION_HIDE_IMMEDIATELY,
+      internal::SessionStateAnimator::ANIMATION_SPEED_IMMEDIATE);
+  AnimateBackgroundAppearanceIfNecessary(
+      internal::SessionStateAnimator::ANIMATION_SPEED_MOVE_WINDOWS,
+      observer);
+
+  observer->Unpause();
+
+  DispatchCancelMode();
+  FOR_EACH_OBSERVER(LockStateObserver, observers_,
+      OnLockStateEvent(LockStateObserver::EVENT_LOCK_ANIMATION_STARTED));
+}
+
+void LockStateController::StartCancellablePreLockAnimation() {
+  animating_lock_ = true;
+  StoreUnlockedProperties();
+
+  base::Closure next_animation_starter =
+      base::Bind(&LockStateController::PreLockAnimationFinished,
+      base::Unretained(this), true /* request_lock */);
+  AnimationFinishedObserver* observer =
+      new AnimationFinishedObserver(next_animation_starter);
+
+  observer->Pause();
+
+  animator_->StartAnimationWithObserver(
+      internal::SessionStateAnimator::NON_LOCK_SCREEN_CONTAINERS,
+      internal::SessionStateAnimator::ANIMATION_LIFT,
+      internal::SessionStateAnimator::ANIMATION_SPEED_UNDOABLE,
+      observer);
+  animator_->StartAnimationWithObserver(
+      internal::SessionStateAnimator::LAUNCHER,
+      internal::SessionStateAnimator::ANIMATION_FADE_OUT,
+      internal::SessionStateAnimator::ANIMATION_SPEED_UNDOABLE,
+      observer);
+  // Hide the screen locker containers so we can raise them later.
+  animator_->StartAnimation(
+      internal::SessionStateAnimator::LOCK_SCREEN_CONTAINERS,
+      internal::SessionStateAnimator::ANIMATION_HIDE_IMMEDIATELY,
+      internal::SessionStateAnimator::ANIMATION_SPEED_IMMEDIATE);
+  AnimateBackgroundAppearanceIfNecessary(
+      internal::SessionStateAnimator::ANIMATION_SPEED_UNDOABLE,
+      observer);
+
+  DispatchCancelMode();
+  FOR_EACH_OBSERVER(LockStateObserver, observers_,
+      OnLockStateEvent(LockStateObserver::EVENT_PRELOCK_ANIMATION_STARTED));
+  observer->Unpause();
+}
+
+void LockStateController::CancelPreLockAnimation() {
+  base::Closure next_animation_starter =
+      base::Bind(&LockStateController::LockAnimationCancelled,
+      base::Unretained(this));
+  AnimationFinishedObserver* observer =
+      new AnimationFinishedObserver(next_animation_starter);
+
+  observer->Pause();
+
+  animator_->StartAnimationWithObserver(
+      internal::SessionStateAnimator::NON_LOCK_SCREEN_CONTAINERS,
+      internal::SessionStateAnimator::ANIMATION_UNDO_LIFT,
+      internal::SessionStateAnimator::ANIMATION_SPEED_UNDO_MOVE_WINDOWS,
+      observer);
+  animator_->StartAnimationWithObserver(
+      internal::SessionStateAnimator::LAUNCHER,
+      internal::SessionStateAnimator::ANIMATION_FADE_IN,
+      internal::SessionStateAnimator::ANIMATION_SPEED_UNDO_MOVE_WINDOWS,
+      observer);
+  AnimateBackgroundHidingIfNecessary(
+      internal::SessionStateAnimator::ANIMATION_SPEED_UNDO_MOVE_WINDOWS,
+      observer);
+
+  observer->Unpause();
+}
+
+void LockStateController::StartPostLockAnimation() {
+  base::Closure next_animation_starter =
+      base::Bind(&LockStateController::PostLockAnimationFinished,
+      base::Unretained(this));
+
+  AnimationFinishedObserver* observer =
+      new AnimationFinishedObserver(next_animation_starter);
+
+  observer->Pause();
+  animator_->StartAnimationWithObserver(
+      internal::SessionStateAnimator::LOCK_SCREEN_CONTAINERS,
+      internal::SessionStateAnimator::ANIMATION_RAISE_TO_SCREEN,
+      internal::SessionStateAnimator::ANIMATION_SPEED_MOVE_WINDOWS,
+      observer);
+  observer->Unpause();
+}
+
+void LockStateController::StartUnlockAnimationBeforeUIDestroyed(
+    base::Closure& callback) {
+  animator_->StartAnimationWithCallback(
+      internal::SessionStateAnimator::LOCK_SCREEN_CONTAINERS,
+      internal::SessionStateAnimator::ANIMATION_LIFT,
+      internal::SessionStateAnimator::ANIMATION_SPEED_MOVE_WINDOWS,
+      callback);
+}
+
+void LockStateController::StartUnlockAnimationAfterUIDestroyed() {
+  base::Closure next_animation_starter =
+      base::Bind(&LockStateController::UnlockAnimationAfterUIDestroyedFinished,
+                 base::Unretained(this));
+
+  AnimationFinishedObserver* observer =
+      new AnimationFinishedObserver(next_animation_starter);
+
+  observer->Pause();
+
+  animator_->StartAnimationWithObserver(
+      internal::SessionStateAnimator::NON_LOCK_SCREEN_CONTAINERS,
+      internal::SessionStateAnimator::ANIMATION_DROP,
+      internal::SessionStateAnimator::ANIMATION_SPEED_MOVE_WINDOWS,
+      observer);
+  animator_->StartAnimationWithObserver(
+      internal::SessionStateAnimator::LAUNCHER,
+      internal::SessionStateAnimator::ANIMATION_FADE_IN,
+      internal::SessionStateAnimator::ANIMATION_SPEED_MOVE_WINDOWS,
+      observer);
+  AnimateBackgroundHidingIfNecessary(
+      internal::SessionStateAnimator::ANIMATION_SPEED_MOVE_WINDOWS,
+      observer);
+  observer->Unpause();
+}
+
+void LockStateController::LockAnimationCancelled() {
+  can_cancel_lock_animation_ = false;
+  RestoreUnlockedProperties();
+}
+
+void LockStateController::PreLockAnimationFinished(bool request_lock) {
+  can_cancel_lock_animation_ = false;
+
+  if (request_lock) {
+    Shell::GetInstance()->delegate()->RecordUserMetricsAction(
+        shutdown_after_lock_ ?
+        UMA_ACCEL_LOCK_SCREEN_POWER_BUTTON :
+        UMA_ACCEL_LOCK_SCREEN_LOCK_BUTTON);
+    delegate_->RequestLockScreen();
+  }
+
+  lock_fail_timer_.Start(
+      FROM_HERE,
+      base::TimeDelta::FromMilliseconds(kLockFailTimeoutMs),
+      this,
+      &LockStateController::OnLockFailTimeout);
+}
+
+void LockStateController::PostLockAnimationFinished() {
+  animating_lock_ = false;
+
+  FOR_EACH_OBSERVER(LockStateObserver, observers_,
+      OnLockStateEvent(LockStateObserver::EVENT_LOCK_ANIMATION_FINISHED));
+  if (!lock_screen_displayed_callback_.is_null()) {
+    lock_screen_displayed_callback_.Run();
+    lock_screen_displayed_callback_.Reset();
+  }
+  if (shutdown_after_lock_) {
+    shutdown_after_lock_ = false;
+    StartLockToShutdownTimer();
+  }
+}
+
+void LockStateController::UnlockAnimationAfterUIDestroyedFinished() {
+  RestoreUnlockedProperties();
+}
+
+void LockStateController::StoreUnlockedProperties() {
+  if (!unlocked_properties_) {
+    unlocked_properties_.reset(new UnlockedStateProperties());
+    unlocked_properties_->background_is_hidden = IsBackgroundHidden();
+  }
+  if (unlocked_properties_->background_is_hidden) {
+    // Hide background so that it can be animated later.
+    animator_->StartAnimation(
+        internal::SessionStateAnimator::DESKTOP_BACKGROUND,
+        internal::SessionStateAnimator::ANIMATION_HIDE_IMMEDIATELY,
+        internal::SessionStateAnimator::ANIMATION_SPEED_IMMEDIATE);
+    ShowBackground();
+  }
+}
+
+void LockStateController::RestoreUnlockedProperties() {
+  if (!unlocked_properties_)
+    return;
+  if (unlocked_properties_->background_is_hidden) {
+    HideBackground();
+    // Restore background visibility.
+    animator_->StartAnimation(
+        internal::SessionStateAnimator::DESKTOP_BACKGROUND,
+        internal::SessionStateAnimator::ANIMATION_FADE_IN,
+        internal::SessionStateAnimator::ANIMATION_SPEED_IMMEDIATE);
+  }
+  unlocked_properties_.reset();
+}
+
+void LockStateController::AnimateBackgroundAppearanceIfNecessary(
+    internal::SessionStateAnimator::AnimationSpeed speed,
+    ui::LayerAnimationObserver* observer) {
+  if (unlocked_properties_.get() &&
+      unlocked_properties_->background_is_hidden) {
+    animator_->StartAnimationWithObserver(
+        internal::SessionStateAnimator::DESKTOP_BACKGROUND,
+        internal::SessionStateAnimator::ANIMATION_FADE_IN,
+        speed,
+        observer);
+  }
+}
+
+void LockStateController::AnimateBackgroundHidingIfNecessary(
+    internal::SessionStateAnimator::AnimationSpeed speed,
+    ui::LayerAnimationObserver* observer) {
+  if (unlocked_properties_.get() &&
+      unlocked_properties_->background_is_hidden) {
+    animator_->StartAnimationWithObserver(
+        internal::SessionStateAnimator::DESKTOP_BACKGROUND,
+        internal::SessionStateAnimator::ANIMATION_FADE_OUT,
+        speed,
+        observer);
+  }
+}
 
 }  // namespace ash