Fix off-by-one bug for the negative transition in XIdle::AddIdleTimeout, which

src/platform/power_manager/xidle.h

 // Copyright (c) 2009 The Chromium OS Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef SRC_PLATFORM_POWER_MANAGER_XIDLE_H_
 #define SRC_PLATFORM_POWER_MANAGER_XIDLE_H_
 
 #include <X11/Xlib.h>
 #include <X11/extensions/sync.h>
 #include <list>
 #include "base/basictypes.h"
 
 namespace power_manager {
 
 // \brief Connect to the local X Server and receive notifications when
 // the user is marked as idle, or as no longer idle.
 //
 // Creating a new XIdle object connects to the local X Server. When the object
 // is destroyed, the connection is also destroyed.
 //
 // \example
 // power_manager::XIdle idle;
-// idle.Init();
+// Display* display = XOpenDisplay(NULL);
+// idle.Init(display);
 // idle.AddIdleTimeout(2000);
 // idle.AddIdleTimeout(5000);
 // int64 idle_time;
 // bool is_idle;
 // while (idle.Monitor(&is_idle, &idle_time)) {
 //   if (is_idle)
 //     std::cout << "User has been idle for " << idle_time << " ms\n";
 //   else
 //     std::cout << "User is active\n";
 // }
+// XCloseDisplay(display);
 // \end_example
 
 class XIdle {
  public:
   XIdle();
   ~XIdle();
 
-  // Connect to the X server and initialize the object.
+  // Initialize the object with the given X connection.
   // On success, return true; otherwise return false.
-  bool Init();
+  bool Init(Display* display);
 
   // Add a timeout value. If the user exceeds this timeout value,
   // the Monitor function will return and notify us. If there are
   // multiple idle timeouts, the Monitor function will return every
   // time each of the idle timeouts is exceeded.
   //
   // On success, return true; otherwise return false.
   bool AddIdleTimeout(int64 idle_timeout_ms);
 
   // Monitor how long the user has been idle. The function will return
@@ skipping 32 matching lines @@
   // A list of the alarms. If non-empty, the negative transition alarm for
   // min_timeout_ will be the first alarm in the list.
   std::list<XSyncAlarm> alarms_;
 
   DISALLOW_COPY_AND_ASSIGN(XIdle);
 };
 
 }  // namespace power_manager
 
 #endif  // SRC_PLATFORM_POWER_MANAGER_XIDLE_H_