Collects stats on how user interacts with the bubble.

chrome/browser/ui/views/session_crashed_bubble_view.h

Index: chrome/browser/ui/views/session_crashed_bubble_view.h
diff --git a/chrome/browser/ui/views/session_crashed_bubble_view.h b/chrome/browser/ui/views/session_crashed_bubble_view.h
index a2d75bd18911cbf03431718071596d6d2c0a9f47..ea5a904a70778b375d813312f0e5206b4dff828d 100644
--- a/chrome/browser/ui/views/session_crashed_bubble_view.h
+++ b/chrome/browser/ui/views/session_crashed_bubble_view.h
@@ -62,6 +62,7 @@ class SessionCrashedBubbleView
   virtual base::string16 GetWindowTitle() const OVERRIDE;
   virtual bool ShouldShowWindowTitle() const OVERRIDE;
   virtual bool ShouldShowCloseButton() const OVERRIDE;
+  virtual void OnWidgetDestroying(views::Widget* widget) OVERRIDE;
 
   // views::BubbleDelegateView methods.
   virtual void Init() OVERRIDE;
@@ -129,6 +130,10 @@ class SessionCrashedBubbleView
   // Whether or not a navigation has started on current tab.
   bool started_navigation_;
 
+  // Whether or not the user chose to restore previous session. It is used to
+  // collect bubble usage stats.
+  bool restored_;
+
   DISALLOW_COPY_AND_ASSIGN(SessionCrashedBubbleView);
 };