Fix Volume slider is captured in screenshot done in touchview mode

ash/common/system/tray/system_tray.h

Index: ash/common/system/tray/system_tray.h
diff --git a/ash/common/system/tray/system_tray.h b/ash/common/system/tray/system_tray.h
index 9029cb16f70f1bdc8e728bd069cfb97fd7b382cf..35d9b9f6b24bc081ebb1541745d48fc49ed1d277 100644
--- a/ash/common/system/tray/system_tray.h
+++ b/ash/common/system/tray/system_tray.h
@@ -74,8 +74,9 @@ class ASH_EXPORT SystemTray : public TrayBackgroundView,
   // seconds.
   void SetDetailedViewCloseDelay(int close_delay);
 
-  // Hides the detailed view for |item|.
-  void HideDetailedView(SystemTrayItem* item);
+  // Hides the detailed view for |item|. If |animate| is false, disable
+  // the hiding animation for hiding |item|.
+  void HideDetailedView(SystemTrayItem* item, bool animate);
 
   // Shows the notification view for |item|.
   void ShowNotificationView(SystemTrayItem* item);