Fix status area accessability issues.

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 cac7ebeb9008713ad9822af9e2236dda345ce124..7ef24c7a4b8818ca317db71b659b66d032803122 100644
--- a/ash/system/tray/system_tray_bubble.cc
+++ b/ash/system/tray/system_tray_bubble.cc
@@ -320,10 +320,12 @@ void SystemTrayBubble::BubbleViewDestroyed() {
 
 void SystemTrayBubble::OnMouseEnteredView() {
   StopAutoCloseTimer();
+  tray_->UpdateShouldShowLauncher();
 }
 
 void SystemTrayBubble::OnMouseExitedView() {
   RestartAutoCloseTimer();
+  tray_->UpdateShouldShowLauncher();
 }
 
 void SystemTrayBubble::OnClickedOutsideView() {
@@ -331,6 +333,10 @@ void SystemTrayBubble::OnClickedOutsideView() {
     bubble_widget_->Close();
 }
 
+string16 SystemTrayBubble::GetAccessibleName() {
+  return tray_->GetAccessibleName();
+}
+
 void SystemTrayBubble::DestroyItemViews() {
   for (std::vector<ash::SystemTrayItem*>::iterator it = items_.begin();
        it != items_.end();