Update voice interaction burst animation

ash/shelf/app_list_button.h

Index: ash/shelf/app_list_button.h
diff --git a/ash/shelf/app_list_button.h b/ash/shelf/app_list_button.h
index 6ad539601bbd6235fd9bed9a63f4a9a679b34ef7..732d36180350365aa08ac3ede4baaa7470d4c5fe 100644
--- a/ash/shelf/app_list_button.h
+++ b/ash/shelf/app_list_button.h
@@ -67,6 +67,8 @@ class ASH_EXPORT AppListButton : public views::ImageButton,
                                   aura::Window* root_window) override;
   void OnVoiceInteractionStatusChanged(bool running) override;
 
+  void StartVoiceInteractionAnimation();
+
   // True if the app list is currently showing for this display.
   // This is useful because other IsApplistVisible functions aren't per-display.
   bool is_showing_app_list_;
@@ -80,6 +82,8 @@ class ASH_EXPORT AppListButton : public views::ImageButton,
 
   VoiceInteractionOverlay* voice_interaction_overlay_;
   std::unique_ptr<base::OneShotTimer> voice_interaction_animation_delay_timer_;
+  std::unique_ptr<base::OneShotTimer>
+      voice_interaction_animation_hide_delay_timer_;
 
   bool voice_interaction_running_ = false;