Add unit tests for screen capture and share notification UI.

ash/system/chromeos/screen_security/screen_tray_item.h

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef ASH_SYSTEM_CHROMEOS_SCREEN_TRAY_ITEM_H_
 #define ASH_SYSTEM_CHROMEOS_SCREEN_TRAY_ITEM_H_
 
 #include "ash/system/tray/system_tray.h"
 #include "ash/system/tray/system_tray_item.h"
 #include "ash/system/tray/system_tray_notifier.h"
@@ skipping 81 matching lines @@
 
   DISALLOW_COPY_AND_ASSIGN(ScreenNotificationView);
 };
 
 }  // namespace tray
 
 
 // The base tray item for screen capture and screen sharing. The
 // Start method brings up a notification and a tray item, and the user
 // can stop the screen capture/sharing by pressing the stop button.
-class ScreenTrayItem : public SystemTrayItem {
+class ASH_EXPORT ScreenTrayItem : public SystemTrayItem {
  public:
   explicit ScreenTrayItem(SystemTray* system_tray);
   virtual ~ScreenTrayItem();
 
   tray::ScreenTrayView* tray_view() { return tray_view_; }
   void set_tray_view(tray::ScreenTrayView* tray_view) {
     tray_view_ = tray_view;
   }
 
   tray::ScreenStatusView* default_view() { return default_view_; }
@@ skipping 32 matching lines @@
   bool is_started_;
   base::Closure stop_callback_;
 
   DISALLOW_COPY_AND_ASSIGN(ScreenTrayItem);
 };
 
 }  // namespace internal
 }  // namespace ash
 
 #endif  // ASH_SYSTEM_CHROMEOS_SCREEN_TRAY_ITEM_H_