Open system menu when click the status tray with volume popup opend

ash/system/tray/system_tray.h

 // Copyright (c) 2012 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_SYSTEM_TRAY_SYSTEM_TRAY_H_

[tdanderson, 2017/04/19 18:47:43]

nit: typo in the CL description (opend->opened)

nit: Also please include a brief CL description, linking to the CL that caused
this regression.

 #define ASH_SYSTEM_TRAY_SYSTEM_TRAY_H_
 
 #include <map>
 #include <memory>
 #include <vector>
 
 #include "ash/ash_export.h"
 #include "ash/system/tray/system_tray_bubble.h"
 #include "ash/system/tray/tray_background_view.h"
 #include "base/macros.h"
@@ skipping 179 matching lines @@
   void CloseSystemBubbleAndDeactivateSystemTray();
 
   // Records UMA metrics for the number of user-visible rows in the system menu
   // and the percentage of the work area height covered by the system menu.
   void RecordSystemMenuMetrics();
 
   // Overridden from ActionableView.
   bool PerformAction(const ui::Event& event) override;
 
   // The web notification tray view that appears adjacent to this view.
-  WebNotificationTray* web_notification_tray_;
+  WebNotificationTray* web_notification_tray_ = nullptr;
 
   // Items.
   std::vector<std::unique_ptr<SystemTrayItem>> items_;
 
   // Pointers to members of |items_|.
-  SystemTrayItem* detailed_item_;
+  SystemTrayItem* detailed_item_ = nullptr;
 
   // Mappings of system tray item and it's view in the tray.
   std::map<SystemTrayItem*, views::View*> tray_item_map_;
 
   // Bubble for default and detailed views.
   std::unique_ptr<SystemBubbleWrapper> system_bubble_;
 
   // Keep track of the default view height so that when we create detailed
   // views directly (e.g. from a notification) we know what height to use.
-  int default_bubble_height_;
+  int default_bubble_height_ = 0;
 
   // This is true when the displayed system tray menu is a full tray menu,
   // otherwise a single line item menu like the volume slider is shown.
   // Note that the value is only valid when |system_bubble_| is true.
-  bool full_system_tray_menu_;
+  bool full_system_tray_menu_ = false;
 
   // These objects are not owned by this class.
-  TrayAccessibility* tray_accessibility_;
-  TrayAudio* tray_audio_;  // May be null.
-  TrayCast* tray_cast_;
-  TrayNetwork* tray_network_;
-  TrayTiles* tray_tiles_;  // only used in material design.
-  TraySystemInfo* tray_system_info_;  // only used in material design.
-  TrayUpdate* tray_update_;
+  TrayAccessibility* tray_accessibility_ = nullptr;
+  TrayAudio* tray_audio_ = nullptr;  // May be null.
+  TrayCast* tray_cast_ = nullptr;
+  TrayNetwork* tray_network_ = nullptr;
+  TrayTiles* tray_tiles_ = nullptr;
+  TraySystemInfo* tray_system_info_ = nullptr;
+  TrayUpdate* tray_update_ = nullptr;
 
   // A reference to the Screen share and capture item.
-  ScreenTrayItem* screen_capture_tray_item_;  // not owned
-  ScreenTrayItem* screen_share_tray_item_;    // not owned
+  ScreenTrayItem* screen_capture_tray_item_ = nullptr;  // not owned
+  ScreenTrayItem* screen_share_tray_item_ = nullptr;    // not owned
 
   std::unique_ptr<KeyEventWatcher> key_event_watcher_;
 
   std::unique_ptr<ActivationObserver> activation_observer_;
 
   DISALLOW_COPY_AND_ASSIGN(SystemTray);
 };
 
 }  // namespace ash
 
 #endif  // ASH_SYSTEM_TRAY_SYSTEM_TRAY_H_