Don't reopen avatar bubble view on second click

chrome/browser/ui/views/bubble/bubble.h

Index: chrome/browser/ui/views/bubble/bubble.h
diff --git a/chrome/browser/ui/views/bubble/bubble.h b/chrome/browser/ui/views/bubble/bubble.h
index fcd6d60b59f369c9f81d88bfbd8b9b07f5917acc..9d61666603763a9faa3af5399c713538626d7fae 100644
--- a/chrome/browser/ui/views/bubble/bubble.h
+++ b/chrome/browser/ui/views/bubble/bubble.h
@@ -6,6 +6,7 @@
 #define CHROME_BROWSER_UI_VIEWS_BUBBLE_BUBBLE_H_
 #pragma once
 
+#include "base/observer_list.h"
 #include "views/bubble/bubble_border.h"
 #include "ui/base/animation/animation_delegate.h"
 #include "views/accelerator.h"
@@ -86,6 +87,12 @@ class Bubble
       public views::AcceleratorTarget,
       public ui::AnimationDelegate {
  public:
+  class Observer {
+   public:
+    // See BubbleDelegate::BubbleClosing for when this is called.
+    virtual void OnBubbleClosing() = 0;
+  };
+
   // Shows the Bubble.
   // |parent| is set as the parent window.
   // |contents| are the contents shown in the bubble.
@@ -144,6 +151,14 @@ class Bubble
   views::View* contents() const { return contents_; }
 #endif
 
+  void AddObserver(Observer* obs) {
+    observer_list_.AddObserver(obs);
+  }
+
+  void RemoveObserver(Observer* obs) {
+    observer_list_.RemoveObserver(obs);
+  }
+
   static const SkColor kBackgroundColor;
 
  protected:
@@ -243,6 +258,8 @@ class Bubble
 
   bool accelerator_registered_;
 
+  ObserverList<Observer> observer_list_;
+
   DISALLOW_COPY_AND_ASSIGN(Bubble);
 };