Fix uber tray to accept focus via tab selection

R=sadrul@chromium.org
BUG=chromium-os:119308


Review URL: http://codereview.chromium.org/10116018

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@133580 0039d316-1c4b-4281-b951-d872f2087c98

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;
 }