Add WebNotificationTray to the status area

ash/system/tray/system_tray_bubble.cc

 // Copyright (c) 2012 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.
 
 #include "ash/system/tray/system_tray_bubble.h"
 
 #include "ash/shell.h"
 #include "ash/system/tray/system_tray.h"
 #include "ash/system/tray/system_tray_delegate.h"
 #include "ash/system/tray/system_tray_item.h"
@@ skipping 365 matching lines @@
 void SystemTrayBubble::RestartAutoCloseTimer() {
   if (autoclose_delay_)
     StartAutoCloseTimer(autoclose_delay_);
 }
 
 void SystemTrayBubble::Close() {
   if (bubble_widget_)
     bubble_widget_->Close();
 }
 
+void SystemTrayBubble::SetVisible(bool is_visible) {
+  if (!bubble_widget_)
+    return;
+  if (is_visible)
+    bubble_widget_->Show();
+  else
+    bubble_widget_->Hide();
+}
+
+bool SystemTrayBubble::IsVisible() {
+  return bubble_widget_ && bubble_widget_->IsVisible();
+}
+
 void SystemTrayBubble::CreateItemViews(user::LoginStatus login_status) {
   for (std::vector<ash::SystemTrayItem*>::iterator it = items_.begin();
        it != items_.end();
        ++it) {
     views::View* view = NULL;
     switch (bubble_type_) {
       case BUBBLE_TYPE_DEFAULT:
         view = (*it)->CreateDefaultView(login_status);
         break;
       case BUBBLE_TYPE_DETAILED:
@@ skipping 53 matching lines @@
 }
 
 void SystemTrayBubble::OnWidgetClosing(views::Widget* widget) {
   CHECK_EQ(bubble_widget_, widget);
   bubble_widget_ = NULL;
   tray_->RemoveBubble(this);
 }
 
 }  // namespace internal
 }  // namespace ash