Do not activate system tray bubble by default

ash/common/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_COMMON_SYSTEM_TRAY_SYSTEM_TRAY_H_
 #define ASH_COMMON_SYSTEM_TRAY_SYSTEM_TRAY_H_
 
 #include <map>
 #include <memory>
 #include <vector>
 
 #include "ash/ash_export.h"
 #include "ash/common/system/tray/system_tray_bubble.h"
 #include "ash/common/system/tray/tray_background_view.h"
 #include "base/macros.h"
 #include "base/memory/scoped_vector.h"
 #include "ui/views/bubble/tray_bubble_view.h"
 #include "ui/views/view.h"
 
 namespace ash {
 
+class KeyEventWatcher;
 enum class LoginStatus;
 class ScreenTrayItem;
 class SystemBubbleWrapper;
 class SystemTrayDelegate;
 class SystemTrayItem;
 class TrayAccessibility;
 class TrayAudio;
 class TrayCast;
 class TrayDate;
 class TrayUpdate;
@@ skipping 128 matching lines @@
     return tray_accessibility_;
   }
 
   // Get the tray item view (or NULL) for a given |tray_item| in a unit test.
   views::View* GetTrayItemViewForTest(SystemTrayItem* tray_item);
 
   TrayCast* GetTrayCastForTesting() const;
   TrayDate* GetTrayDateForTesting() const;
   TrayUpdate* GetTrayUpdateForTesting() const;
 
+  // Activate the system tay bubble.

[James Cook, 2016/09/22 21:17:16]

nit: tay -> tray

[oshima, 2016/09/23 09:37:20]

Done.

+  void ActivateBubble();
+
  private:
+  void CloseBubble(const ui::KeyEvent& key_event);

[James Cook, 2016/09/22 21:17:16]

nit: document. For example, why is it different than CloseSystemBubble.

[oshima, 2016/09/23 09:37:20]

Done.

+
+  // Acitavates the bubble and starts key navigation with the |key_event|.

[James Cook, 2016/09/22 21:17:16]

nit: activates

[oshima, 2016/09/23 09:37:20]

Done.

+  void ActivateAndStartNavigation(const ui::KeyEvent& key_event);
+
   // Creates the default set of items for the sytem tray.
   void CreateItems(SystemTrayDelegate* delegate);
 
   // Resets |system_bubble_| and clears any related state.
   void DestroySystemBubble();
 
   // Resets |notification_bubble_| and clears any related state.
   void DestroyNotificationBubble();
 
   // Returns a string with the current time for accessibility on the status
@@ skipping 75 matching lines @@
   TrayAccessibility* tray_accessibility_;
   TrayAudio* tray_audio_;  // May be null.
   TrayCast* tray_cast_;
   TrayDate* tray_date_;
   TrayUpdate* tray_update_;
 
   // A reference to the Screen share and capture item.
   ScreenTrayItem* screen_capture_tray_item_;  // not owned
   ScreenTrayItem* screen_share_tray_item_;    // not owned
 
+  std::unique_ptr<KeyEventWatcher> key_event_watcher_;
+
   DISALLOW_COPY_AND_ASSIGN(SystemTray);
 };
 
 }  // namespace ash
 
 #endif  // ASH_COMMON_SYSTEM_TRAY_SYSTEM_TRAY_H_