Broadcast NotifyTimezoneChange to all RenderProcessHosts when the system time zone changes

content/browser/time_zone_monitor_android.cc

+// 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_android.h"
+
+#include "base/android/jni_android.h"
+#include "jni/TimeZoneMonitor_jni.h"
+
+namespace content {
+
+TimeZoneMonitorAndroid::TimeZoneMonitorAndroid() : TimeZoneMonitor() {
+  JNIEnv* env = base::android::AttachCurrentThread();
+  impl_.Reset(Java_TimeZoneMonitor_getInstance(

[bulach, 2014/04/29 08:33:44]

how about making getInstance() call start() if needed, to avoid this extra JNI
roundtrip?
(or the other way around, make start() return the instance)

[Mark Mentovai, 2014/04/29 16:01:05]

bulach wrote:
I did this, and then I folded start() into the constructor to simplify it even
further.

+      env, base::android::GetApplicationContext()));
+  Java_TimeZoneMonitor_start(
+      env, impl_.obj(), reinterpret_cast<intptr_t>(this));
+}
+
+TimeZoneMonitorAndroid::~TimeZoneMonitorAndroid() {
+  Java_TimeZoneMonitor_stop(base::android::AttachCurrentThread(), impl_.obj());
+}
+
+// static
+bool TimeZoneMonitorAndroid::Register(JNIEnv* env) {
+  return RegisterNativesImpl(env);
+}
+
+void TimeZoneMonitorAndroid::TimeZoneChangedFromJava(JNIEnv* env,
+                                                     jobject caller) {
+  NotifyRenderers();
+}
+
+// static
+scoped_ptr<TimeZoneMonitor> TimeZoneMonitor::Create() {
+  return scoped_ptr<TimeZoneMonitor>(new TimeZoneMonitorAndroid());
+}
+
+}  // namespace content