Mojoify time zone update IPC from browser to renderer

content/browser/time_zone_monitor.h

 // 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.
 
 #ifndef CONTENT_BROWSER_TIME_ZONE_MONITOR_H_
 #define CONTENT_BROWSER_TIME_ZONE_MONITOR_H_
 
 #include <memory>
 
 #include "base/macros.h"
+#include "device/time_zone_monitor/public/interfaces/time_zone_monitor.mojom.h"
+#include "mojo/public/cpp/bindings/binding_set.h"
 
 namespace content {
 
 // TimeZoneMonitor watches the system time zone, and notifies renderers
 // when it changes. Some renderer code caches the system time zone, so
 // this notification is necessary to inform such code that cached
 // timezone data may have become invalid. Due to sandboxing, it is not
 // possible for renderer processes to monitor for system time zone
 // changes themselves, so this must happen in the browser process.
 //
 // Sandboxing also may prevent renderer processes from reading the time
 // zone when it does change, so platforms may have to deal with this in
 // platform-specific ways:
 //  - Mac uses a sandbox hole defined in content/renderer/renderer.sb.
 //  - Linux-based platforms use ProxyLocaltimeCallToBrowser in
 //    content/zygote/zygote_main_linux.cc and HandleLocaltime in
 //    content/browser/renderer_host/sandbox_ipc_linux.cc to override
 //    localtime in renderer processes with custom code that calls
 //    localtime in the browser process via Chrome IPC.
 
-class TimeZoneMonitor {
+class TimeZoneMonitor : public device::mojom::TimeZoneMonitor {
  public:
   // Returns a new TimeZoneMonitor object (likely a subclass) specific to the
   // platform.
   static std::unique_ptr<TimeZoneMonitor> Create();
 
-  virtual ~TimeZoneMonitor();
+  ~TimeZoneMonitor() override;
+
+  void Bind(device::mojom::TimeZoneMonitorRequest request);
 
  protected:
   TimeZoneMonitor();
 
-  // Loop over all renderers and notify them that the system time zone may
-  // have changed.
-  void NotifyRenderers();
+  // Notify all callbacks that the system time zone may have changed.
+  void NotifyClients();
 
  private:
+  // device::mojom::device::mojom::TimeZoneMonitor:
+  void QueryNextTimeZoneChange(
+      const device::mojom::TimeZoneMonitor::QueryNextTimeZoneChangeCallback&
+          callback) override;
+
+  mojo::BindingSet<device::mojom::TimeZoneMonitor> bindings_;
+  std::vector<device::mojom::TimeZoneMonitor::QueryNextTimeZoneChangeCallback>
+      on_time_zone_change_tasks_;
   DISALLOW_COPY_AND_ASSIGN(TimeZoneMonitor);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_TIME_ZONE_MONITOR_H_