Log operator code histogram on new metric log

chrome/browser/chrome_browser_metrics_service_observer.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 "chrome/browser/chrome_browser_metrics_service_observer.h"
+
+#include "chrome/browser/metrics/metrics_service.h"
+#include "net/base/network_change_notifier.h"
+
+ChromeBrowserMetricsServiceObserver::ChromeBrowserMetricsServiceObserver() {
+  MetricsServiceHelper::AddMetricsServiceObserver(this);
+}
+
+ChromeBrowserMetricsServiceObserver::~ChromeBrowserMetricsServiceObserver() {
+  MetricsServiceHelper::RemoveMetricsServiceObserver(this);
+}
+
+void ChromeBrowserMetricsServiceObserver::OnDidCreateMetricsLog() {
+  net::NetworkChangeNotifier::LogOperatorCodeHistogram(
+      net::NetworkChangeNotifier::GetConnectionType());
+}