[Aura] Polish app list.

ui/aura_shell/app_list.cc

Index: ui/aura_shell/app_list.cc
diff --git a/ui/aura_shell/app_list.cc b/ui/aura_shell/app_list.cc
index 0218713b9e3a8419a54a09ae33229d2946bd726c..d6f6f760178265fae7295bc6d473f22f78d9c1bd 100644
--- a/ui/aura_shell/app_list.cc
+++ b/ui/aura_shell/app_list.cc
@@ -62,6 +62,7 @@ void AppList::SetVisible(bool visible) {
     ScheduleAnimation();
   } else if (is_visible_ && !set_widget_factory_.HasWeakPtrs()) {
     Shell::GetInstance()->delegate()->RequestAppListWidget(
+        GetPreferredBounds(false),
         base::Bind(&AppList::SetWidget, set_widget_factory_.GetWeakPtr()));
   }
 }
@@ -88,7 +89,6 @@ void AppList::SetWidget(views::Widget* widget) {
     ScheduleAnimation();
 
     widget_->Show();
-    widget_->Activate();
   } else {
     widget->Close();
   }
@@ -162,6 +162,8 @@ void AppList::OnLayerAnimationScheduled(
 
 void AppList::OnWidgetClosing(views::Widget* widget) {
   DCHECK(widget_ == widget);
+  if (is_visible_)
+    SetVisible(false);
   ResetWidget();
 }