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

chrome/browser/idle_linux.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 <gdk/gdk.h>
 #include <gdk/gdkx.h>
 
 #include <vector>
@@ skipping 46 matching lines @@
 
 bool ScreensaverWindowExists() {
   ScreensaverWindowFinder finder;
   gtk_util::EnumerateTopLevelWindows(&finder);
   return finder.exists();
 }
 
 }
 
 void CalculateIdleState(unsigned int idle_threshold, IdleCallback notify) {
-  // Usually the screensaver is used to lock the screen, so we do not need to
-  // check if the workstation is locked.
-  gdk_error_trap_push();
-  bool result = ScreensaverWindowExists();
-  bool got_error = gdk_error_trap_pop();
-  if (result && !got_error) {
+  if (IsWorkstationInLockedState()) {
     notify.Run(IDLE_STATE_LOCKED);
     return;
   }
-
   browser::IdleQueryLinux idle_query;
   unsigned int idle_time = idle_query.IdleTime();
   if (idle_time >= idle_threshold)
     notify.Run(IDLE_STATE_IDLE);
   else
     notify.Run(IDLE_STATE_ACTIVE);
 }
+
+bool IsWorkstationInLockedState() {
+  // Usually the screensaver is used to lock the screen, so we do not need to
+  // check if the workstation is locked.
+  gdk_error_trap_push();
+  bool result = ScreensaverWindowExists();
+  bool got_error = gdk_error_trap_pop();
+  return result && !got_error;
+}