Do not activate system tray bubble by default

ash/common/system/tray/actionable_view.h

Index: ash/common/system/tray/actionable_view.h
diff --git a/ash/common/system/tray/actionable_view.h b/ash/common/system/tray/actionable_view.h
index bef1bf8e16421fc34d10f8e6e6716cc40a99ec3b..f3e031e6b43a6eac4f1ae2cd7ec73679daae257a 100644
--- a/ash/common/system/tray/actionable_view.h
+++ b/ash/common/system/tray/actionable_view.h
@@ -10,6 +10,7 @@
 #include "ui/views/view.h"
 
 namespace ash {
+class SystemTrayItem;
 
 // A focusable view that performs an action when user clicks on it, or presses
 // enter or space when focused. Note that the action is triggered on mouse-up,
@@ -21,14 +22,18 @@ class ASH_EXPORT ActionableView : public views::View {
  public:
   static const char kViewClassName[];
 
-  ActionableView();
+  explicit ActionableView(SystemTrayItem* owner);

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

nit: document that |owner| can be null, and what that means.

[oshima, 2016/09/23 09:37:19]

Done.

 
   ~ActionableView() override;
 
   void SetAccessibleName(const base::string16& name);
   const base::string16& accessible_name() const { return accessible_name_; }
 
+  void CloseSystemBubble();

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

nit: document

[oshima, 2016/09/23 09:37:19]

Done.

+
  protected:
+  SystemTrayItem* owner() { return owner_; }
+
   void OnPaintFocus(gfx::Canvas* canvas);
 
   // Returns the bounds to paint the focus rectangle in.
@@ -54,6 +59,8 @@ class ASH_EXPORT ActionableView : public views::View {
   void OnGestureEvent(ui::GestureEvent* event) override;
 
  private:
+  SystemTrayItem* owner_;
+
   base::string16 accessible_name_;
   bool has_capture_;