[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 "core/dom/ExecutionContext.h"
+#include "core/dom/ExecutionContextTask.h"
+#include "core/workers/WorkerThread.h"
+#include "public/platform/InterfaceProvider.h"
+#include "public/platform/Platform.h"
+#include "third_party/icu/source/i18n/unicode/timezone.h"
+#include <v8.h>
+
+namespace blink {
+
+namespace {
+
+// Notify V8 that the date/time configuration of the system might have changed.
+void NotifyTimezoneChange(ExecutionContext* context) {
+  v8::Isolate* isolate = v8::Isolate::GetCurrent();

[leonhsl(Using Gerrit), 2016/10/12 13:54:44]

As haraken@ commented, v8::Isolate::GetCurrent() is deprecated and should be
avoided, I've investigated around but can't find out a proper way. Is it
possible to get the v8::Isolate instance from ExecutionContext? Thanks.

[haraken, 2016/10/12 14:13:19]

We have toIsolate(ExecutionContext*).

[leonhsl(Using Gerrit), 2016/10/13 09:28:53]

Got it and thanks!

+  if (!isolate)
+    return;
+  v8::Date::DateTimeConfigurationChangeNotification(isolate);
+}
+
+}  // namespace
+
+// static
+void TimeZoneMonitorClient::Init() {
+  static TimeZoneMonitorClient* instance = nullptr;
+  if (!instance)
+    instance = new TimeZoneMonitorClient();
+}
+
+TimeZoneMonitorClient::TimeZoneMonitorClient() : m_binding(this) {
+  device::mojom::blink::TimeZoneMonitorPtr monitor;
+  Platform::current()->interfaceProvider()->getInterface(
+      mojo::GetProxy(&monitor));
+  monitor->AddClient(m_binding.CreateInterfacePtrAndBind());
+}
+
+TimeZoneMonitorClient::~TimeZoneMonitorClient() {}
+
+void TimeZoneMonitorClient::OnTimeZoneChange(const WTF::String& timeZoneInfo) {
+  if (!timeZoneInfo.isEmpty()) {
+    icu::TimeZone* zone = icu::TimeZone::createTimeZone(
+        icu::UnicodeString::fromUTF8(timeZoneInfo.utf8().data()));
+    icu::TimeZone::adoptDefault(zone);
+    VLOG(1) << "ICU default timezone is set to " << timeZoneInfo;
+  }
+
+  NotifyTimezoneChange(nullptr);

[leonhsl(Using Gerrit), 2016/10/12 13:54:44]

For the main thread, how could we get the v8::Isolate instance? Thanks.

+  WorkerThread::PostTaskToAllWorkerThreads(
+      BLINK_FROM_HERE, createCrossThreadTask(&NotifyTimezoneChange));
+}
+
+}  // namespace blink