[Cronet] Move NetworkChangeNotifier initialization off UI thread

components/cronet/android/network_change_notifier_initer.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 "components/cronet/android/network_change_notifier_initer.h"
+
+#include <jni.h>
+
+#include "jni/NetworkChangeNotifierIniter_jni.h"
+#include "net/android/network_change_notifier_factory_android.h"
+#include "net/base/network_change_notifier.h"
+
+namespace cronet {
+
+void NetworkChangeNotifierInit(
+    JNIEnv* env,
+    const base::android::JavaParamRef<jclass>& jcaller) {
+  net::NetworkChangeNotifier::SetFactory(
+      new net::NetworkChangeNotifierFactoryAndroid());
+  net::NetworkChangeNotifier::Create();
+}
+
+void NetworkChangeNotifierInit() {
+  JNIEnv* env = base::android::AttachCurrentThread();
+  Java_NetworkChangeNotifierIniter_init(env);
+}
+
+// Explicitly register static JNI functions.
+bool NetworkChangeNotifierIniterRegisterJni(JNIEnv* env) {
+  return RegisterNativesImpl(env);
+}
+
+}  // namespace cronet