Suppress "errors" that aren't really errors.

remoting/webapp/suspend_monitor.js

Index: remoting/webapp/suspend_monitor.js
diff --git a/remoting/webapp/suspend_monitor.js b/remoting/webapp/suspend_monitor.js
new file mode 100644
index 0000000000000000000000000000000000000000..ec45444e0e779f695f9875326385d58f90f2d1ec
--- /dev/null
+++ b/remoting/webapp/suspend_monitor.js
@@ -0,0 +1,51 @@
+// 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.
+
+/**
+ * @fileoverview
+ * Class to detect when the device is suspended, for example when a laptop's
+ * lid is closed.
+ */
+
+
+'use strict';
+
+/** @suppress {duplicate} */
+var remoting = remoting || {};
+
+/**
+ * @param {function():void} callback Callback function to invoke when a
+ * suspend+resume operation has been detected.
+ *
+ * @constructor
+ */
+remoting.SuspendMonitor = function (callback) {
+  /** @type {function():void} @private */
+  this.callback_ = callback;
+  /** @type {number} @private */
+  this.timerIntervalMs_ = 60 * 1000;
+  /** @type {number} @private */
+  this.lateToleranceMs_ = 60 * 1000;
+  /** @type {number} @private */
+  this.callbackExpectedTime_ = 0;
+  this.start_();
+};
+
+/** @private */
+remoting.SuspendMonitor.prototype.start_ = function() {
+  window.setTimeout(this.checkSuspend_.bind(this), this.timerIntervalMs_);
+  this.callbackExpectedTime_ = new Date().getTime() + this.timerIntervalMs_;
+};
+
+/** @private */
+remoting.SuspendMonitor.prototype.checkSuspend_ = function() {
+  var lateByMs = new Date().getTime() - this.callbackExpectedTime_;
+  if (lateByMs > this.lateToleranceMs_) {
+    this.callback_();
+  }
+  this.start_();
+};
+
+/** @type {remoting.SuspendMonitor?} */
+remoting.suspendMonitor = null;