Prevent hiding a toast during animation

ash/common/system/toast/toast_overlay.cc

Index: ash/common/system/toast/toast_overlay.cc
diff --git a/ash/common/system/toast/toast_overlay.cc b/ash/common/system/toast/toast_overlay.cc
index 87d49c687e703ab71e236c569190dc65a394d786..2e0f5452b0bbddfeaf74e8d7d9731dce9d4f0818 100644
--- a/ash/common/system/toast/toast_overlay.cc
+++ b/ash/common/system/toast/toast_overlay.cc
@@ -253,6 +253,8 @@ void ToastOverlay::Show(bool visible) {
 
   ui::LayerAnimator* animator = overlay_widget_->GetLayer()->GetAnimator();
   DCHECK(animator);
+  if (animator->is_animating())
+    return;

[oshima, 2016/07/14 13:18:31]

won't his also prevent showing during hiding animation? Is it ok?

[yoshiki, 2016/07/15 02:38:30]

It doesn't happen, since a toast overlay instance is not reused. The toast
manager instanciates new ToastOverlay after hiding animation of previous toast.

I added DCHECK.

 
   base::TimeDelta original_duration = animator->GetTransitionDuration();
   ui::ScopedLayerAnimationSettings animation_settings(animator);