Implement notifications for the DisplayBalloon method on Linux and Mac.

chrome/browser/ui/cocoa/status_icons/status_icon_mac.h

Index: chrome/browser/ui/cocoa/status_icons/status_icon_mac.h
diff --git a/chrome/browser/ui/cocoa/status_icons/status_icon_mac.h b/chrome/browser/ui/cocoa/status_icons/status_icon_mac.h
index ff6e078e01da0b1993e067fe0650281baeee9536..0316e02f3a481ce5551971029b6d5a89a1991df7 100644
--- a/chrome/browser/ui/cocoa/status_icons/status_icon_mac.h
+++ b/chrome/browser/ui/cocoa/status_icons/status_icon_mac.h
@@ -11,6 +11,7 @@
 #include "base/compiler_specific.h"
 #include "base/memory/scoped_nsobject.h"
 #include "base/string16.h"
+#include "chrome/browser/status_icons/desktop_notification_balloon.h"
 #include "chrome/browser/status_icons/status_icon.h"
 
 class SkBitmap;
@@ -22,7 +23,7 @@ class StatusIconMac : public StatusIcon {
   StatusIconMac();
   virtual ~StatusIconMac();
 
-  // Overridden from StatusIcon
+  // Overridden from StatusIcon.
   virtual void SetImage(const SkBitmap& image) OVERRIDE;
   virtual void SetPressedImage(const SkBitmap& image) OVERRIDE;
   virtual void SetToolTip(const string16& tool_tip) OVERRIDE;
@@ -41,6 +42,9 @@ class StatusIconMac : public StatusIcon {
 
   scoped_nsobject<StatusItemController> controller_;
 
+  // Notification balloon.
+  DesktopNotificationBalloon notification_;
+
   DISALLOW_COPY_AND_ASSIGN(StatusIconMac);
 };