NQE: Exclude network observations from private networks

net/nqe/network_quality_estimator_util.h

Index: net/nqe/network_quality_estimator_util.h
diff --git a/net/nqe/network_quality_estimator_util.h b/net/nqe/network_quality_estimator_util.h
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+// 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.
+
+#ifndef NET_NQE_NETWORK_QUALITY_ESTIMATOR_UTIL_H_
+#define NET_NQE_NETWORK_QUALITY_ESTIMATOR_UTIL_H_
+
+#include "net/base/net_export.h"
+
+namespace net {
+
+class HostPortPair;
+class HostResolver;
+class NetLogWithSource;
+
+namespace nqe {
+
+namespace internal {
+
+// Returns true if the host contained in |host_port_pair| is a host in a
+// private Internet as defined by RFC 1918 or if the requests to
+// |host_port_pair| are not expected to generate useful network quality
+// information. This includes localhost, hosts on private subnets, and
+// hosts on subnets that are reserved for specific usage, and are unlikely
+// to be used by public web servers.
+// To make this determination, IsPrivateHost() makes the best
+// effort estimate including trying to resolve the host in the
+// |host_port_pair|. The method is synchronous.
+// |host_resolver| must not be null.
+NET_EXPORT_PRIVATE bool IsPrivateHost(HostResolver* host_resolver,
+                                      const HostPortPair& host_port_pair,
+                                      const NetLogWithSource& net_log);
+
+}  // namespace internal
+
+}  // namespace nqe
+
+}  // namespace net
+
+#endif  // NET_NQE_NETWORK_QUALITY_ESTIMATOR_UTIL_H_