[Notifications] Fix swipe to close for ARC notifications.

ui/message_center/views/slide_out_controller.cc

Index: ui/message_center/views/slide_out_controller.cc
diff --git a/ui/message_center/views/slide_out_controller.cc b/ui/message_center/views/slide_out_controller.cc
index 68883b672db5c8d28770dd095ce7a9e91c9828a8..efcf8e027d1d5581e45c60e281c052fc306ff667 100644
--- a/ui/message_center/views/slide_out_controller.cc
+++ b/ui/message_center/views/slide_out_controller.cc
@@ -72,6 +72,7 @@ void SlideOutController::OnGestureEvent(ui::GestureEvent* event) {
     RestoreVisualState();
   }
 
+  delegate_->OnSlideChanged();

[Evan Stade, 2017/05/16 21:58:14]

Can the interested party (ArcCustomNotificationView) observe animations on the
slide out layer via LayerAnimationObserver?

[Eliot Courtney, 2017/05/17 04:48:25]

I tried this (by adding an override for OnLayerAnimationStarted), but it seems
to me like the animation is only for when the notification is slid out to close
(SlideOutAndClose), or restored back to its original position
(RestoreVisualState). ArcCustomNotificationView still needs to know about the
'animation' during the gesture.

   event->SetHandled();
 }
 
@@ -100,6 +101,7 @@ void SlideOutController::SlideOutAndClose(int direction) {
   transform.Translate(direction < 0 ? -width : width, 0.0);
   layer->SetTransform(transform);
   layer->SetOpacity(0.f);
+  delegate_->OnSlideChanged();
 }
 
 void SlideOutController::OnImplicitAnimationsCompleted() {