ash: Make power button menu animation faster.

Bug: 826063
Change-Id: I1930da3effd7952d2019e480048778075a0bcd58
Reviewed-on: https://chromium-review.googlesource.com/981686
Commit-Queue: Min Chen <minch@chromium.org>
Reviewed-by: Dan Erat <derat@chromium.org>
Reviewed-by: Qiang Xu <warx@google.com>
Cr-Commit-Position: refs/heads/master@{#546960}

ash/system/power/power_button_menu_screen_view.cc

@@ -72,8 +72,8 @@ class PowerButtonMenuScreenView::PowerButtonMenuBackgroundView
     animation.AddObserver(this);
     animation.SetTweenType(show ? gfx::Tween::EASE_IN_2
                                 : gfx::Tween::FAST_OUT_LINEAR_IN);
-    animation.SetTransitionDuration(base::TimeDelta::FromMilliseconds(
-        PowerButtonMenuView::kAnimationTimeoutMs));
+    animation.SetTransitionDuration(
+        PowerButtonMenuView::kMenuAnimationDuration);
 
     layer()->SetOpacity(show ? kPowerButtonMenuOpacity : 0.f);
   }

ash/system/power/power_button_menu_view.cc

@@ -55,8 +55,7 @@ void PowerButtonMenuView::ScheduleShowHideAnimation(bool show) {
   animation.AddObserver(this);
   animation.SetTweenType(show ? gfx::Tween::EASE_IN
                               : gfx::Tween::FAST_OUT_LINEAR_IN);
-  animation.SetTransitionDuration(
-      base::TimeDelta::FromMilliseconds(kAnimationTimeoutMs));
+  animation.SetTransitionDuration(kMenuAnimationDuration);
 
   layer()->SetOpacity(show ? 1.0f : 0.f);
 

ash/system/power/power_button_menu_view.h

@@ -21,8 +21,9 @@ class ASH_EXPORT PowerButtonMenuView : public views::View,
                                        public views::ButtonListener,
                                        public ui::ImplicitAnimationObserver {
  public:
-  // The duration of the animation to show or hide the power button menu view.
-  static constexpr int kAnimationTimeoutMs = 500;
+  // The duration of showing or dismissing power button menu animation.
+  static constexpr base::TimeDelta kMenuAnimationDuration =
+      base::TimeDelta::FromMilliseconds(250);
 
   // Distance of the menu animation transform.
   static constexpr int kMenuViewTransformDistanceDp = 16;