Adds a first-run balloon to the Windows notification center.

chrome/browser/ui/views/message_center/web_notification_tray.h

Index: chrome/browser/ui/views/message_center/web_notification_tray.h
diff --git a/chrome/browser/ui/views/message_center/web_notification_tray.h b/chrome/browser/ui/views/message_center/web_notification_tray.h
index dc79b24be2f7ae6cc9c06e6b82a995724eb542d5..67e2d4f0656d964f1322535cd0a573b0c498ac46 100644
--- a/chrome/browser/ui/views/message_center/web_notification_tray.h
+++ b/chrome/browser/ui/views/message_center/web_notification_tray.h
@@ -62,6 +62,13 @@ class WebNotificationTray : public message_center::MessageCenterTrayDelegate,
 
   // StatusIconObserver implementation.
   virtual void OnStatusIconClicked() OVERRIDE;
+#if defined(OS_WIN)
+  virtual void OnBalloonClicked() OVERRIDE;
+
+  // This shows a platform-specific balloon informing the user of the existence
+  // of the message center in the status tray area.
+  void DisplayFirstRunBalloon();
+#endif
 
   // Changes the icon and hovertext based on number of unread notifications.
   void UpdateStatusIcon();