Fixing the bug, that caused UI to hang after unsupported device was inserted.

chrome/browser/idle_chromeos.cc

 // Copyright (c) 2011 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 "chrome/browser/idle.h"
 
 #include "base/bind.h"
 #include "base/callback.h"
 #include "chrome/browser/chromeos/cros/cros_library.h"
 #include "chrome/browser/chromeos/cros/power_library.h"
 
 void CalculateIdleStateNotifier(unsigned int idle_treshold,
                                 IdleCallback notify,
                                 int64_t idle_time_s) {
   if (idle_time_s >= (int64_t)idle_treshold) {
     notify.Run(IDLE_STATE_IDLE);
   } else if (idle_time_s < 0) {
     notify.Run(IDLE_STATE_UNKNOWN);
   } else {
     notify.Run(IDLE_STATE_ACTIVE);
   }
 }
 
 void CalculateIdleState(unsigned int idle_threshold, IdleCallback notify) {
+  if (CheckIdleStateIsLocked()) {
+    notify.Run(IDLE_STATE_LOCKED);
+    return;
+  }
   chromeos::CalculateIdleTimeCallback* callback =
       new base::Callback<void(int64_t)>(base::Bind(&CalculateIdleStateNotifier,
                                         idle_threshold,
                                         notify));
   chromeos::CrosLibrary::Get()->GetPowerLibrary()->CalculateIdleTime(callback);
 }
+
+bool CheckIdleStateIsLocked() {
+  // TODO(sidor): Make it work.
+  return false;
+}