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_);
+}
+
+NetworkQualityEstimatorProviderImpl::~NetworkQualityEstimatorProviderImpl() {
+  DCHECK(thread_checker_.CalledOnValidThread());
+}
+
+scoped_refptr<base::SequencedTaskRunner>
+NetworkQualityEstimatorProviderImpl::GetTaskRunner() {
+  DCHECK(thread_checker_.CalledOnValidThread());
+  // |this| is constructed on UI thread, but must be used on the IO thread.
+  thread_checker_.DetachFromThread();
+  return content::BrowserThread::GetTaskRunnerForThread(
+      content::BrowserThread::IO);
+}
+
+net::NetworkQualityEstimator*
+NetworkQualityEstimatorProviderImpl::GetNetworkQualityEstimator() {
+  DCHECK(thread_checker_.CalledOnValidThread());
+  DCHECK(content::BrowserThread::CurrentlyOn(content::BrowserThread::IO));
+  return io_thread_->globals()->network_quality_estimator.get();
+}
+
+}  // namespace metrics