Add EffectiveConnectionType enum to the system profile proto

chrome/browser/metrics/network_quality_estimator_provider_impl.cc

+// Copyright 2017 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/metrics/network_quality_estimator_provider_impl.h"
+
+#include "chrome/browser/io_thread.h"
+#include "content/public/browser/browser_thread.h"
+
+namespace net {
+class NetworkQualityEstimator;
+}
+
+namespace metrics {
+
+NetworkQualityEstimatorProviderImpl::NetworkQualityEstimatorProviderImpl(
+    IOThread* io_thread)
+    : io_thread_(io_thread) {
+  DCHECK(io_thread_);
+  // |this| is constructed on UI thread, but must be used on the IO thread.
+  thread_checker_.DetachFromThread();
+}
+
+NetworkQualityEstimatorProviderImpl::~NetworkQualityEstimatorProviderImpl() {
+  DCHECK(thread_checker_.CalledOnValidThread());
+}
+
+void NetworkQualityEstimatorProviderImpl::ProvideEstimator(
+    const base::Callback<void(net::NetworkQualityEstimator*)>& callback) {
+  DCHECK(thread_checker_.CalledOnValidThread());
+  DCHECK(content::BrowserThread::CurrentlyOn(content::BrowserThread::IO));
+  callback.Run(io_thread_->globals()->network_quality_estimator.get());
+}
+
+}  // namespace metrics