Broadcast NotifyTimezoneChange to all RenderProcessHosts when the system time zone changes

content/browser/time_zone_monitor_mac.mm

+// Copyright 2014 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 "content/browser/time_zone_monitor.h"
+
+#import <Foundation/Foundation.h>
+
+namespace content {
+
+class TimeZoneMonitorMac : public TimeZoneMonitor {
+ public:
+  TimeZoneMonitorMac() : TimeZoneMonitor() {
+    NSNotificationCenter* nc = [NSNotificationCenter defaultCenter];
+    notification_observer_ =
+        [nc addObserverForName:NSSystemTimeZoneDidChangeNotification
+                        object:nil
+                         queue:nil
+                    usingBlock:^(NSNotification* notification) {
+                        NotifyRenderers();
+                    }];
+  }
+
+  virtual ~TimeZoneMonitorMac() {
+    NSNotificationCenter* nc = [NSNotificationCenter defaultCenter];
+    [nc removeObserver:notification_observer_];
+  }
+
+ private:
+  id notification_observer_;
+
+  DISALLOW_COPY_AND_ASSIGN(TimeZoneMonitorMac);
+};
+
+// static
+scoped_ptr<TimeZoneMonitor> TimeZoneMonitor::Create() {
+  return scoped_ptr<TimeZoneMonitor>(new TimeZoneMonitorMac());
+}
+
+}  // namespace content