Close tray bubble before disabling UI for sign-in.

chrome/browser/chromeos/login/ui/webui_login_view.cc

Index: chrome/browser/chromeos/login/ui/webui_login_view.cc
diff --git a/chrome/browser/chromeos/login/ui/webui_login_view.cc b/chrome/browser/chromeos/login/ui/webui_login_view.cc
index 65b2c75fcb42aa20f6fed4507b9b4d90cb94da78..c1be463e368346392d4e97511a7b0626e2594796 100644
--- a/chrome/browser/chromeos/login/ui/webui_login_view.cc
+++ b/chrome/browser/chromeos/login/ui/webui_login_view.cc
@@ -348,7 +348,10 @@ void WebUILoginView::SetStatusAreaVisible(bool visible) {
 
 void WebUILoginView::SetUIEnabled(bool enabled) {
   forward_keyboard_event_ = enabled;
-  ash::Shell::GetInstance()->GetPrimarySystemTray()->SetEnabled(enabled);
+  ash::SystemTray* tray = ash::Shell::GetInstance()->GetPrimarySystemTray();
+  if (!enabled && tray->HasSystemBubble())

[achuithb, 2015/06/19 23:52:06]

Could you please add a comment here summarizing what you have in the description
of this CL? It's not obvious from looking at the code.

+    tray->CloseSystemBubble();
+  tray->SetEnabled(enabled);
 }
 
 void WebUILoginView::AddFrameObserver(FrameObserver* frame_observer) {