[TimeZoneMonitor] Decouple renderer side impl from content to blink.

third_party/WebKit/Source/modules/time_zone_monitor/TimeZoneMonitorClient.cpp

+// Copyright 2016 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 "modules/time_zone_monitor/TimeZoneMonitorClient.h"
+
+#include "base/bind.h"
+#include "core/workers/WorkerBackingThread.h"
+#include "public/platform/InterfaceProvider.h"
+#include "public/platform/Platform.h"
+#include "third_party/icu/source/i18n/unicode/timezone.h"
+#include <v8.h>
+
+namespace {
+
+// Notify V8 that the date/time configuration of the system might have changed.
+void NotifyTimezoneChangeOnThisThread() {
+  v8::Isolate* isolate = v8::Isolate::GetCurrent();
+  if (!isolate)
+    return;
+  v8::Date::DateTimeConfigurationChangeNotification(isolate);
+}
+
+}  // namespace
+
+namespace blink {
+
+// static
+void TimeZoneMonitorClient::Init() {
+  static TimeZoneMonitorClient* instance = nullptr;
+  if (!instance)
+    instance = new TimeZoneMonitorClient();
+}
+
+TimeZoneMonitorClient::TimeZoneMonitorClient() : m_binding(this) {
+  device::mojom::TimeZoneMonitorPtr monitor;
+  Platform::current()->interfaceProvider()->getInterface(
+      mojo::GetProxy(&monitor));
+  monitor->AddClient(m_binding.CreateInterfacePtrAndBind());
+}
+
+TimeZoneMonitorClient::~TimeZoneMonitorClient() {}
+
+void TimeZoneMonitorClient::OnTimeZoneChange(const std::string& tzInfo) {
+  if (!tzInfo.empty()) {
+    icu::TimeZone* zone =
+        icu::TimeZone::createTimeZone(icu::UnicodeString::fromUTF8(tzInfo));
+    icu::TimeZone::adoptDefault(zone);
+    VLOG(1) << "ICU default timezone is set to " << tzInfo;
+  }
+
+  NotifyTimezoneChangeOnThisThread();
+  WorkerBackingThread::PostTaskToAllThreads(
+      base::Bind(&NotifyTimezoneChangeOnThisThread));

[leonhsl(Using Gerrit), 2016/10/10 12:56:02]

Presubmit ERRORS: Do not use Chromium class from namespace base inside Blink
core.

+}
+
+}  // namespace blink