Fix uber tray to accept focus via tab selection

chrome/browser/chromeos/login/webui_login_view.cc

Index: chrome/browser/chromeos/login/webui_login_view.cc
diff --git a/chrome/browser/chromeos/login/webui_login_view.cc b/chrome/browser/chromeos/login/webui_login_view.cc
index 7fa2a75bb045610bedbc02748fa8046d223084fd..752cfa370173ac760f0ba8dccf508c17cabd2f10 100644
--- a/chrome/browser/chromeos/login/webui_login_view.cc
+++ b/chrome/browser/chromeos/login/webui_login_view.cc
@@ -317,6 +317,13 @@ bool WebUILoginView::IsPopupOrPanel(const WebContents* source) const {
 }
 
 bool WebUILoginView::TakeFocus(bool reverse) {
+  ash::SystemTray* tray = ash::Shell::GetInstance()->tray();
+  if (tray) {
+    tray->SetNextFocusableView(this);
+    ash::Shell::GetInstance()->RotateFocus(reverse ? ash::Shell::BACKWARD :
+                                                     ash::Shell::FORWARD);
+  }
+
   return true;
 }