Add WebNotificationTray to the status area

ash/system/tray/system_tray_bubble.cc

Index: ash/system/tray/system_tray_bubble.cc
diff --git a/ash/system/tray/system_tray_bubble.cc b/ash/system/tray/system_tray_bubble.cc
index 51fd8f60569c08ff548fc45b27e4ed1e0026e40b..6329a5d571bd56cbc208fbefb6544802da8c87de 100644
--- a/ash/system/tray/system_tray_bubble.cc
+++ b/ash/system/tray/system_tray_bubble.cc
@@ -298,6 +298,7 @@ void SystemTrayBubble::InitView(const InitParams& init_params) {
 
 void SystemTrayBubble::BubbleViewDestroyed() {
   DestroyItemViews();
+  bubble_view_ = NULL;

[stevenjb, 2012/06/13 19:05:02]

I added this here also, just to be safe.

 }
 
 gfx::Rect SystemTrayBubble::GetAnchorRect() const {
@@ -384,6 +385,19 @@ void SystemTrayBubble::Close() {
     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();