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 86b867eb6b1ee486b86c965e216f923b2505fbaa..d48c864d830a1bb9d49213b887c5b3965fb624fe 100644
--- a/chrome/browser/ui/views/message_center/web_notification_tray.h
+++ b/chrome/browser/ui/views/message_center/web_notification_tray.h
@@ -61,11 +61,18 @@ class WebNotificationTray : public message_center::MessageCenterTrayDelegate,
 
   // StatusIconObserver implementation.
   virtual void OnStatusIconClicked() OVERRIDE;
+  virtual void OnBalloonClicked() OVERRIDE;
 
   // Changes the icon and hovertext based on number of unread notifications.
   void UpdateStatusIcon();
   void HideBubbleWithView(const views::TrayBubbleView* bubble_view);
 
+#if defined(OS_WIN)
+  // This shows a platform-specific balloon informing the user of the existence
+  // of the message center in the status tray area.
+  void DisplayFirstRunBalloon();
+#endif
+
  private:
   FRIEND_TEST_ALL_PREFIXES(WebNotificationTrayTest, WebNotifications);
   FRIEND_TEST_ALL_PREFIXES(WebNotificationTrayTest, WebNotificationPopupBubble);