Update voice interaction burst animation

ash/shelf/app_list_button.h

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef ASH_SHELF_APP_LIST_BUTTON_H_
 #define ASH_SHELF_APP_LIST_BUTTON_H_
 
 #include <memory>
 
 #include "ash/ash_export.h"
@@ skipping 49 matching lines @@
   std::unique_ptr<views::InkDrop> CreateInkDrop() override;
   std::unique_ptr<views::InkDropMask> CreateInkDropMask() const override;
   void PaintButtonContents(gfx::Canvas* canvas) override;
 
  private:
   // ShellObserver overrides:
   void OnAppListVisibilityChanged(bool shown,
                                   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_;
 
   // Color used to paint the background.
   SkColor background_color_;
 
   InkDropButtonListener* listener_;
   ShelfView* shelf_view_;
   Shelf* shelf_;
 
   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;
 
   DISALLOW_COPY_AND_ASSIGN(AppListButton);
 };
 
 }  // namespace ash
 
 #endif  // ASH_SHELF_APP_LIST_BUTTON_H_