ash: Extract animator from PowerButtonController

ash/wm/power_button_controller.cc

 // Copyright (c) 2012 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/power_button_controller.h"
 
 #include "ash/ash_switches.h"
 #include "ash/shell.h"
 #include "ash/shell_delegate.h"
 #include "ash/shell_window_ids.h"
-#include "ash/wm/cursor_manager.h"
+#include "ash/wm/session_state_animator.h"
 #include "base/command_line.h"
-#include "base/logging.h"
-#include "base/time.h"
-#include "third_party/skia/include/core/SkColor.h"
-#include "ui/aura/env.h"
 #include "ui/aura/root_window.h"
 #include "ui/aura/shared/compound_event_filter.h"
-#include "ui/aura/window.h"
-#include "ui/compositor/layer.h"
-#include "ui/compositor/layer_animation_element.h"
-#include "ui/compositor/layer_animation_sequence.h"
-#include "ui/compositor/layer_animator.h"
-#include "ui/gfx/canvas.h"
-#include "ui/gfx/rect.h"
-#include "ui/gfx/size.h"
-#include "ui/gfx/transform.h"
 
 namespace ash {
 
 namespace {
 
 // Amount of time that the power button needs to be held before we lock the
 // screen.
 const int kLockTimeoutMs = 400;
 
 // Amount of time that the power button needs to be held before we shut down.
@@ skipping 14 matching lines @@
 
 // Amount of time taken to scale the snapshot of the screen back to its original
 // size when the button is released.
 const int kUndoSlowCloseAnimMs = 100;
 
 // Amount of time taken to scale the snapshot down to a point in the center of
 // the screen once the screen has been locked or we've been notified that the
 // system is shutting down.
 const int kFastCloseAnimMs = 150;
 
-// Amount of time taken to make the lock window fade in when the screen is
-// locked.
-const int kLockFadeInAnimMs = 200;
-
 // Additional time (beyond kFastCloseAnimMs) to wait after starting the
 // fast-close shutdown animation before actually requesting shutdown, to give
 // the animation time to finish.
 const int kShutdownRequestDelayMs = 50;
 
-// Slightly-smaller size that we scale the screen down to for the pre-lock and
-// pre-shutdown states.
-const float kSlowCloseSizeRatio = 0.95f;
+}  // namespace
 
-// Returns the transform that should be applied to containers for the slow-close
-// animation.
-ui::Transform GetSlowCloseTransform() {
-  gfx::Size root_size = Shell::GetPrimaryRootWindow()->bounds().size();
-  ui::Transform transform;
-  transform.SetScale(kSlowCloseSizeRatio, kSlowCloseSizeRatio);
-  transform.ConcatTranslate(
-      floor(0.5 * (1.0 - kSlowCloseSizeRatio) * root_size.width() + 0.5),
-      floor(0.5 * (1.0 - kSlowCloseSizeRatio) * root_size.height() + 0.5));
-  return transform;
+PowerButtonController::TestApi::TestApi(PowerButtonController* controller)
+    : controller_(controller),
+      animator_api_(new internal::SessionStateAnimator::TestApi(
+                        controller->animator_.get())) {
 }
 
-// Returns the transform that should be applied to containers for the fast-close
-// animation.
-ui::Transform GetFastCloseTransform() {
-  gfx::Size root_size = Shell::GetPrimaryRootWindow()->bounds().size();
-  ui::Transform transform;
-  transform.SetScale(0.0, 0.0);
-  transform.ConcatTranslate(floor(0.5 * root_size.width() + 0.5),
-                            floor(0.5 * root_size.height() + 0.5));
-  return transform;
-}
-
-// Slowly shrinks |window| to a slightly-smaller size.
-void StartSlowCloseAnimationForWindow(aura::Window* window) {
-  ui::LayerAnimator* animator = window->layer()->GetAnimator();
-  animator->set_preemption_strategy(
-      ui::LayerAnimator::IMMEDIATELY_ANIMATE_TO_NEW_TARGET);
-  animator->StartAnimation(
-      new ui::LayerAnimationSequence(
-          ui::LayerAnimationElement::CreateTransformElement(
-              GetSlowCloseTransform(),
-              base::TimeDelta::FromMilliseconds(kSlowCloseAnimMs))));
-}
-
-// Quickly undoes the effects of the slow-close animation on |window|.
-void StartUndoSlowCloseAnimationForWindow(aura::Window* window) {
-  ui::LayerAnimator* animator = window->layer()->GetAnimator();
-  animator->set_preemption_strategy(
-      ui::LayerAnimator::IMMEDIATELY_ANIMATE_TO_NEW_TARGET);
-  animator->StartAnimation(
-      new ui::LayerAnimationSequence(
-          ui::LayerAnimationElement::CreateTransformElement(
-              ui::Transform(),
-              base::TimeDelta::FromMilliseconds(kUndoSlowCloseAnimMs))));
-}
-
-// Quickly shrinks |window| down to a point in the center of the screen and
-// fades it out to 0 opacity.
-void StartFastCloseAnimationForWindow(aura::Window* window) {
-  ui::LayerAnimator* animator = window->layer()->GetAnimator();
-  animator->set_preemption_strategy(
-      ui::LayerAnimator::IMMEDIATELY_ANIMATE_TO_NEW_TARGET);
-  animator->StartAnimation(
-      new ui::LayerAnimationSequence(
-          ui::LayerAnimationElement::CreateTransformElement(
-              GetFastCloseTransform(),
-              base::TimeDelta::FromMilliseconds(kFastCloseAnimMs))));
-  animator->StartAnimation(
-      new ui::LayerAnimationSequence(
-          ui::LayerAnimationElement::CreateOpacityElement(
-              0.0, base::TimeDelta::FromMilliseconds(kFastCloseAnimMs))));
-}
-
-// Fades |window| in to full opacity.
-void FadeInWindow(aura::Window* window) {
-  ui::LayerAnimator* animator = window->layer()->GetAnimator();
-  animator->set_preemption_strategy(
-      ui::LayerAnimator::IMMEDIATELY_ANIMATE_TO_NEW_TARGET);
-  animator->StartAnimation(
-      new ui::LayerAnimationSequence(
-          ui::LayerAnimationElement::CreateOpacityElement(
-              1.0, base::TimeDelta::FromMilliseconds(kLockFadeInAnimMs))));
-}
-
-// Makes |window| fully transparent instantaneously.
-void HideWindow(aura::Window* window) {
-  window->layer()->SetOpacity(0.0);
-}
-
-// Restores |window| to its original position and scale and full opacity
-// instantaneously.
-void RestoreWindow(aura::Window* window) {
-  window->layer()->SetTransform(ui::Transform());
-  window->layer()->SetOpacity(1.0);
-}
-
-// Fills |containers| with the containers described by |container_mask|.
-void GetContainers(int container_mask, aura::Window::Windows* containers) {
-  aura::RootWindow* root_window = Shell::GetPrimaryRootWindow();
-  containers->clear();
-
-  if (container_mask & PowerButtonController::DESKTOP_BACKGROUND) {
-    containers->push_back(Shell::GetContainer(
-        root_window,
-        internal::kShellWindowId_DesktopBackgroundContainer));
-  }
-  if (container_mask & PowerButtonController::LAUNCHER) {
-    containers->push_back(Shell::GetContainer(
-        root_window,
-        internal::kShellWindowId_LauncherContainer));
-  }
-  if (container_mask & PowerButtonController::NON_LOCK_SCREEN_CONTAINERS) {
-    // TODO(antrim): Figure out a way to eliminate a need to exclude launcher
-    // in such way.
-    aura::Window* non_lock_screen_containers = Shell::GetContainer(
-        root_window,
-        internal::kShellWindowId_NonLockScreenContainersContainer);
-    aura::Window::Windows children = non_lock_screen_containers->children();
-
-    for (aura::Window::Windows::const_iterator it = children.begin();
-         it != children.end(); ++it) {
-      aura::Window* window = *it;
-      if (window->id() == internal::kShellWindowId_LauncherContainer)
-        continue;
-      containers->push_back(window);
-    }
-  }
-  if (container_mask & PowerButtonController::LOCK_SCREEN_BACKGROUND) {
-    containers->push_back(Shell::GetContainer(
-        root_window,
-        internal::kShellWindowId_LockScreenBackgroundContainer));
-  }
-  if (container_mask & PowerButtonController::LOCK_SCREEN_CONTAINERS) {
-    containers->push_back(Shell::GetContainer(
-        root_window,
-        internal::kShellWindowId_LockScreenContainersContainer));
-  }
-  if (container_mask & PowerButtonController::LOCK_SCREEN_RELATED_CONTAINERS) {
-    containers->push_back(Shell::GetContainer(
-        root_window,
-        internal::kShellWindowId_LockScreenRelatedContainersContainer));
-  }
-}
-
-// Apply animation |type| to all containers described by |container_mask|.
-void StartAnimation(int container_mask,
-                    PowerButtonController::AnimationType type) {
-  aura::Window::Windows containers;
-  GetContainers(container_mask, &containers);
-
-  for (aura::Window::Windows::const_iterator it = containers.begin();
-       it != containers.end(); ++it) {
-    aura::Window* window = *it;
-    switch (type) {
-      case PowerButtonController::ANIMATION_SLOW_CLOSE:
-        StartSlowCloseAnimationForWindow(window);
-        break;
-      case PowerButtonController::ANIMATION_UNDO_SLOW_CLOSE:
-        StartUndoSlowCloseAnimationForWindow(window);
-        break;
-      case PowerButtonController::ANIMATION_FAST_CLOSE:
-        StartFastCloseAnimationForWindow(window);
-        break;
-      case PowerButtonController::ANIMATION_FADE_IN:
-        FadeInWindow(window);
-        break;
-      case PowerButtonController::ANIMATION_HIDE:
-        HideWindow(window);
-        break;
-      case PowerButtonController::ANIMATION_RESTORE:
-        RestoreWindow(window);
-        break;
-      default:
-        NOTREACHED() << "Unhandled animation type " << type;
-    }
-  }
-}
-
-}  // namespace
-
-bool PowerButtonController::TestApi::ContainersAreAnimated(
-    int container_mask, AnimationType type) const {
-  aura::Window::Windows containers;
-  GetContainers(container_mask, &containers);
-  for (aura::Window::Windows::const_iterator it = containers.begin();
-       it != containers.end(); ++it) {
-    aura::Window* window = *it;
-    ui::Layer* layer = window->layer();
-
-    switch (type) {
-      case PowerButtonController::ANIMATION_SLOW_CLOSE:
-        if (layer->GetTargetTransform() != GetSlowCloseTransform())
-          return false;
-        break;
-      case PowerButtonController::ANIMATION_UNDO_SLOW_CLOSE:
-        if (layer->GetTargetTransform() != ui::Transform())
-          return false;
-        break;
-      case PowerButtonController::ANIMATION_FAST_CLOSE:
-        if (layer->GetTargetTransform() != GetFastCloseTransform() ||
-            layer->GetTargetOpacity() > 0.0001)
-          return false;
-        break;
-      case PowerButtonController::ANIMATION_FADE_IN:
-        if (layer->GetTargetOpacity() < 0.9999)
-          return false;
-        break;
-      case PowerButtonController::ANIMATION_HIDE:
-        if (layer->GetTargetOpacity() > 0.0001)
-          return false;
-        break;
-      case PowerButtonController::ANIMATION_RESTORE:
-        if (layer->opacity() < 0.9999 || layer->transform() != ui::Transform())
-          return false;
-        break;
-      default:
-        NOTREACHED() << "Unhandled animation type " << type;
-        return false;
-    }
-  }
-  return true;
-}
-
-bool PowerButtonController::TestApi::BlackLayerIsVisible() const {
-  return controller_->black_layer_.get() &&
-         controller_->black_layer_->visible();
-}
-
-gfx::Rect PowerButtonController::TestApi::GetBlackLayerBounds() const {
-  ui::Layer* layer = controller_->black_layer_.get();
-  return layer ? layer->bounds() : gfx::Rect();
-}
-
-// static
-int PowerButtonController::GetAllContainersMask() {
-  return PowerButtonController::DESKTOP_BACKGROUND |
-         PowerButtonController::LAUNCHER |
-         PowerButtonController::NON_LOCK_SCREEN_CONTAINERS |
-         GetAllLockScreenContainersMask();
-}
-
-// static
-int PowerButtonController::GetAllLockScreenContainersMask() {
-  return PowerButtonController::LOCK_SCREEN_BACKGROUND |
-         PowerButtonController::LOCK_SCREEN_CONTAINERS |
-         PowerButtonController::LOCK_SCREEN_RELATED_CONTAINERS;
+PowerButtonController::TestApi::~TestApi() {
 }
 
 PowerButtonController::PowerButtonController()
     : login_status_(user::LOGGED_IN_NONE),
       unlocked_login_status_(user::LOGGED_IN_NONE),
       power_button_down_(false),
       lock_button_down_(false),
       screen_is_off_(false),
       shutting_down_(false),
       has_legacy_power_button_(
           CommandLine::ForCurrentProcess()->HasSwitch(
-              switches::kAuraLegacyPowerButton)) {
+              switches::kAuraLegacyPowerButton)),
+      animator_(new internal::SessionStateAnimator()) {
   Shell::GetPrimaryRootWindow()->AddRootWindowObserver(this);
 }
 
 PowerButtonController::~PowerButtonController() {
   Shell::GetPrimaryRootWindow()->RemoveRootWindowObserver(this);
 }
 
 void PowerButtonController::OnLoginStateChanged(user::LoginStatus status) {
   login_status_ = status;
   unlocked_login_status_ = user::LOGGED_IN_NONE;
 }
 
 void PowerButtonController::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.
   if (!shutting_down_) {
     shutting_down_ = true;
     Shell* shell = ash::Shell::GetInstance();
     shell->env_filter()->set_cursor_hidden_by_filter(false);
     shell->cursor_manager()->ShowCursor(false);
-    ShowBlackLayer();
-    StartAnimation(GetAllContainersMask(), ANIMATION_HIDE);
+    animator_->ShowBlackLayer();
+    animator_->StartAnimation(
+        internal::SessionStateAnimator::kAllContainersMask,
+        internal::SessionStateAnimator::ANIMATION_HIDE);
   }
 }
 
 void PowerButtonController::OnLockStateChanged(bool locked) {
   if (shutting_down_ || (login_status_ == user::LOGGED_IN_LOCKED) == locked)
     return;
 
   if (!locked && login_status_ == user::LOGGED_IN_LOCKED) {
     login_status_ = unlocked_login_status_;
     unlocked_login_status_ = user::LOGGED_IN_NONE;
   } else {
     unlocked_login_status_ = login_status_;
     login_status_ = user::LOGGED_IN_LOCKED;
   }
 
   if (locked) {
-    StartAnimation(LOCK_SCREEN_CONTAINERS, ANIMATION_FADE_IN);
+    animator_->StartAnimation(
+        internal::SessionStateAnimator::LOCK_SCREEN_CONTAINERS,
+        internal::SessionStateAnimator::ANIMATION_FADE_IN);
     lock_timer_.Stop();
     lock_fail_timer_.Stop();
 
     if (!has_legacy_power_button_ && power_button_down_) {
       lock_to_shutdown_timer_.Stop();
       lock_to_shutdown_timer_.Start(
           FROM_HERE,
           base::TimeDelta::FromMilliseconds(kLockToShutdownTimeoutMs),
           this, &PowerButtonController::OnLockToShutdownTimeout);
     }
   } else {
-    StartAnimation(DESKTOP_BACKGROUND | LAUNCHER | NON_LOCK_SCREEN_CONTAINERS,
-                   ANIMATION_RESTORE);
-    HideBlackLayer();
+    animator_->StartAnimation(
+        internal::SessionStateAnimator::DESKTOP_BACKGROUND |
+        internal::SessionStateAnimator::LAUNCHER |
+        internal::SessionStateAnimator::NON_LOCK_SCREEN_CONTAINERS,
+        internal::SessionStateAnimator::ANIMATION_RESTORE);
+    animator_->DropBlackLayer();
   }
 }
 
 void PowerButtonController::OnScreenBrightnessChanged(double percent) {
   screen_is_off_ = percent <= 0.001;
 }
 
 void PowerButtonController::OnStartingLock() {
   if (shutting_down_ || login_status_ == user::LOGGED_IN_LOCKED)
     return;
 
   // Ensure that the black layer is visible -- if the screen was locked via
   // the wrench menu, we won't have already shown the black background
   // as part of the slow-close animation.
-  ShowBlackLayer();
+  animator_->ShowBlackLayer();
 
-  StartAnimation(LAUNCHER, ANIMATION_HIDE);
+  animator_->StartAnimation(
+      internal::SessionStateAnimator::LAUNCHER,
+      internal::SessionStateAnimator::ANIMATION_HIDE);
 
-  StartAnimation(NON_LOCK_SCREEN_CONTAINERS, ANIMATION_FAST_CLOSE);
+  animator_->StartAnimation(
+      internal::SessionStateAnimator::NON_LOCK_SCREEN_CONTAINERS,
+      internal::SessionStateAnimator::ANIMATION_FAST_CLOSE);
 
   // Hide the screen locker containers so we can make them fade in later.
-  StartAnimation(LOCK_SCREEN_CONTAINERS, ANIMATION_HIDE);
+  animator_->StartAnimation(
+      internal::SessionStateAnimator::LOCK_SCREEN_CONTAINERS,
+      internal::SessionStateAnimator::ANIMATION_HIDE);
 }
 
 void PowerButtonController::OnPowerButtonEvent(
     bool down, const base::TimeTicks& timestamp) {
   power_button_down_ = down;
 
   if (shutting_down_)
     return;
 
   // Avoid starting the lock/shutdown sequence if the power button is pressed
   // while the screen is off (http://crbug.com/128451).
   if (screen_is_off_)
     return;
 
   if (has_legacy_power_button_) {
     // If power button releases won't get reported correctly because we're not
     // running on official hardware, just lock the screen or shut down
     // immediately.
     if (down) {
-      ShowBlackLayer();
+      animator_->ShowBlackLayer();
       if (LoggedInAsNonGuest() && login_status_ != user::LOGGED_IN_LOCKED) {
-        StartAnimation(NON_LOCK_SCREEN_CONTAINERS, ANIMATION_SLOW_CLOSE);
+        animator_->StartAnimation(
+            internal::SessionStateAnimator::NON_LOCK_SCREEN_CONTAINERS,
+            internal::SessionStateAnimator::ANIMATION_SLOW_CLOSE);
         OnLockTimeout();
       } else {
         OnShutdownTimeout();
       }
     }
   } else {  // !has_legacy_power_button_
     if (down) {
       // If we already have a pending request to lock the screen, wait.
       if (lock_fail_timer_.IsRunning())
         return;
 
       if (LoggedInAsNonGuest() && login_status_ != user::LOGGED_IN_LOCKED)
         StartLockTimer();
       else
         StartShutdownTimer();
     } else {  // Button is up.
       if (lock_timer_.IsRunning() || shutdown_timer_.IsRunning()) {
         if (login_status_ == user::LOGGED_IN_LOCKED) {
           // If we've already started shutdown transition at lock screen
           // desktop background needs to be restored immediately.
-          StartAnimation(DESKTOP_BACKGROUND, ANIMATION_RESTORE);
+          animator_->StartAnimation(
+              internal::SessionStateAnimator::DESKTOP_BACKGROUND,
+              internal::SessionStateAnimator::ANIMATION_RESTORE);
         }
-        StartAnimation(
+        animator_->StartAnimation(
             (login_status_ == user::LOGGED_IN_LOCKED) ?
-            GetAllLockScreenContainersMask() : GetAllContainersMask(),
-            ANIMATION_UNDO_SLOW_CLOSE);
+            internal::SessionStateAnimator::kAllLockScreenContainersMask :
+            internal::SessionStateAnimator::kAllContainersMask,
+            internal::SessionStateAnimator::ANIMATION_UNDO_SLOW_CLOSE);
       }
 
       // Drop the black layer after the undo animation finishes.
       if (lock_timer_.IsRunning() ||
           (shutdown_timer_.IsRunning() && !LoggedInAsNonGuest())) {
-        hide_black_layer_timer_.Stop();
-        hide_black_layer_timer_.Start(
-            FROM_HERE,
-            base::TimeDelta::FromMilliseconds(kUndoSlowCloseAnimMs),
-            this, &PowerButtonController::HideBlackLayer);
+        animator_->ScheduleDropBlackLayer();
       }
 
       lock_timer_.Stop();
       shutdown_timer_.Stop();
       lock_to_shutdown_timer_.Stop();
     }
   }
 }
 
 void PowerButtonController::OnLockButtonEvent(
     bool down, const base::TimeTicks& timestamp) {
   lock_button_down_ = down;
 
   if (shutting_down_ || !LoggedInAsNonGuest())
     return;
 
   // Bail if we're already locked or are in the process of locking.  Also give
   // the power button precedence over the lock button (we don't expect both
   // buttons to be present, so this is just making sure that we don't do
   // something completely stupid if that assumption changes later).
   if (login_status_ == user::LOGGED_IN_LOCKED ||
       lock_fail_timer_.IsRunning() || power_button_down_)
     return;
 
   if (down) {
     StartLockTimer();
   } else {
     if (lock_timer_.IsRunning()) {
-      StartAnimation(NON_LOCK_SCREEN_CONTAINERS, ANIMATION_UNDO_SLOW_CLOSE);
-      hide_black_layer_timer_.Stop();
-      hide_black_layer_timer_.Start(
-          FROM_HERE,
-          base::TimeDelta::FromMilliseconds(kUndoSlowCloseAnimMs),
-          this, &PowerButtonController::HideBlackLayer);
+      animator_->StartAnimation(
+          internal::SessionStateAnimator::NON_LOCK_SCREEN_CONTAINERS,
+          internal::SessionStateAnimator::ANIMATION_UNDO_SLOW_CLOSE);
+      animator_->ScheduleDropBlackLayer();
       lock_timer_.Stop();
     }
   }
 }
 
 void PowerButtonController::RequestShutdown() {
   if (!shutting_down_)
     StartShutdownAnimationAndRequestShutdown();
 }
 
-void PowerButtonController::OnRootWindowResized(const aura::RootWindow* root,
-                                                const gfx::Size& new_size) {
-  if (black_layer_.get())
-    black_layer_->SetBounds(gfx::Rect(root->bounds().size()));
-}
-
 void PowerButtonController::OnRootWindowHostCloseRequested(
                                                 const aura::RootWindow*) {
   if(Shell::GetInstance() && Shell::GetInstance()->delegate())
     Shell::GetInstance()->delegate()->Exit();
 }
 
 bool PowerButtonController::LoggedInAsNonGuest() const {
   if (login_status_ == user::LOGGED_IN_NONE)
     return false;
   if (login_status_ == user::LOGGED_IN_GUEST)
     return false;
   // TODO(mukai): think about kiosk mode.
   return true;
 }
 
 void PowerButtonController::OnLockTimeout() {
   delegate_->RequestLockScreen();
   lock_fail_timer_.Start(
       FROM_HERE,
       base::TimeDelta::FromMilliseconds(kLockFailTimeoutMs),
       this, &PowerButtonController::OnLockFailTimeout);
 }
 
 void PowerButtonController::OnLockFailTimeout() {
   DCHECK_NE(login_status_, user::LOGGED_IN_LOCKED);
   LOG(ERROR) << "Screen lock request timed out";
-  StartAnimation(LAUNCHER | NON_LOCK_SCREEN_CONTAINERS, ANIMATION_RESTORE);
-  HideBlackLayer();
+  animator_->StartAnimation(
+      internal::SessionStateAnimator::LAUNCHER |
+      internal::SessionStateAnimator::NON_LOCK_SCREEN_CONTAINERS,
+      internal::SessionStateAnimator::ANIMATION_RESTORE);
+  animator_->DropBlackLayer();
 }
 
 void PowerButtonController::OnLockToShutdownTimeout() {
   DCHECK_EQ(login_status_, user::LOGGED_IN_LOCKED);
   StartShutdownTimer();
 }
 
 void PowerButtonController::OnShutdownTimeout() {
   if (!shutting_down_)
     StartShutdownAnimationAndRequestShutdown();
 }
 
 void PowerButtonController::OnRealShutdownTimeout() {
   DCHECK(shutting_down_);
   delegate_->RequestShutdown();
 }
 
 void PowerButtonController::StartLockTimer() {
-  ShowBlackLayer();
-  StartAnimation(NON_LOCK_SCREEN_CONTAINERS, ANIMATION_SLOW_CLOSE);
+  animator_->ShowBlackLayer();
+  animator_->StartAnimation(
+      internal::SessionStateAnimator::NON_LOCK_SCREEN_CONTAINERS,
+      internal::SessionStateAnimator::ANIMATION_SLOW_CLOSE);
   lock_timer_.Stop();
   lock_timer_.Start(FROM_HERE,
                     base::TimeDelta::FromMilliseconds(kSlowCloseAnimMs),
                     this, &PowerButtonController::OnLockTimeout);
 }
 
 void PowerButtonController::StartShutdownTimer() {
-  ShowBlackLayer();
-  StartAnimation(GetAllContainersMask(), ANIMATION_SLOW_CLOSE);
+  animator_->ShowBlackLayer();
+  animator_->StartAnimation(
+      internal::SessionStateAnimator::kAllContainersMask,
+      internal::SessionStateAnimator::ANIMATION_SLOW_CLOSE);
   shutdown_timer_.Stop();
   shutdown_timer_.Start(
       FROM_HERE,
       base::TimeDelta::FromMilliseconds(kShutdownTimeoutMs),
       this, &PowerButtonController::OnShutdownTimeout);
 }
 
 void PowerButtonController::StartShutdownAnimationAndRequestShutdown() {
   DCHECK(!shutting_down_);
   shutting_down_ = true;
 
   Shell* shell = ash::Shell::GetInstance();
   shell->env_filter()->set_cursor_hidden_by_filter(false);
   shell->cursor_manager()->ShowCursor(false);
 
-  ShowBlackLayer();
+  animator_->ShowBlackLayer();
   if (login_status_ != user::LOGGED_IN_NONE) {
     // Hide the other containers before starting the animation.
     // ANIMATION_FAST_CLOSE will make the screen locker windows partially
     // transparent, and we don't want the other windows to show through.
-    StartAnimation(LAUNCHER | NON_LOCK_SCREEN_CONTAINERS, ANIMATION_HIDE);
-    StartAnimation(GetAllLockScreenContainersMask(), ANIMATION_FAST_CLOSE);
+    animator_->StartAnimation(
+        internal::SessionStateAnimator::NON_LOCK_SCREEN_CONTAINERS |
+        internal::SessionStateAnimator::LAUNCHER,
+        internal::SessionStateAnimator::ANIMATION_HIDE);
+    animator_->StartAnimation(
+        internal::SessionStateAnimator::kAllLockScreenContainersMask,
+        internal::SessionStateAnimator::ANIMATION_FAST_CLOSE);
   } else {
-    StartAnimation(GetAllContainersMask(), ANIMATION_FAST_CLOSE);
+    animator_->StartAnimation(
+        internal::SessionStateAnimator::kAllContainersMask,
+        internal::SessionStateAnimator::ANIMATION_FAST_CLOSE);
   }
 
   real_shutdown_timer_.Start(
       FROM_HERE,
       base::TimeDelta::FromMilliseconds(
           kFastCloseAnimMs + kShutdownRequestDelayMs),
       this, &PowerButtonController::OnRealShutdownTimeout);
 }
 
-void PowerButtonController::ShowBlackLayer() {
-  if (hide_black_layer_timer_.IsRunning())
-    hide_black_layer_timer_.Stop();
-
-  if (!black_layer_.get()) {
-    black_layer_.reset(new ui::Layer(ui::LAYER_SOLID_COLOR));
-    black_layer_->SetColor(SK_ColorBLACK);
-
-    ui::Layer* root_layer = Shell::GetPrimaryRootWindow()->layer();
-    black_layer_->SetBounds(root_layer->bounds());
-    root_layer->Add(black_layer_.get());
-    root_layer->StackAtBottom(black_layer_.get());
-  }
-  black_layer_->SetVisible(true);
-}
-
-void PowerButtonController::HideBlackLayer() {
-  black_layer_.reset();
-}
-
 }  // namespace ash