Enable the FocusController on DesktopAura too.

ui/views/corewm/corewm_switches.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "ui/views/corewm/corewm_switches.h"
 
 #include "base/command_line.h"
 
 namespace views {
 namespace corewm {
 namespace switches {
 
 // When set uses the old ActivationController/FocusManager instead of the new
 // CoreWM FocusController.
 const char kDisableFocusController[] = "disable-focus-controller";
 
+// When set uses the FocusController in desktop mode.
+const char kEnableFocusControllerOnDesktop[] =
+    "enable-focus-controller-on-desktop";
+
 // If present animations are disabled.
 const char kWindowAnimationsDisabled[] =
     "views-corewm-window-animations-disabled";
 
 }  // namespace switches
 
 bool UseFocusController() {
   return !CommandLine::ForCurrentProcess()->HasSwitch(
       switches::kDisableFocusController);
 }
 
+bool UseFocusControllerOnDesktop() {
+  return CommandLine::ForCurrentProcess()->HasSwitch(
+      switches::kEnableFocusControllerOnDesktop);
+}
+
 }  // namespace corewm
 }  // namespace views