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..b4284a2c70aa02bfde89ad7dfdff19d767febf72 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 |hide_animation| is false, disable
+  // the hiding animation for hiding |item|.
+  void HideDetailedView(SystemTrayItem* item, bool hide_animation);

[Daniel Erat, 2016/07/28 22:20:40]

|hide_animation| is a confusing name, since it could also be interpreted as
"hide the animation", i.e. pass true to not display the animation. please rename
it to something like |animate|.

[Qiang(Joe) Xu, 2016/07/28 23:15:57]

Done.

 
   // Shows the notification view for |item|.
   void ShowNotificationView(SystemTrayItem* item);