Make NQE a derived class of NetworkQualityProvider

net/nqe/network_quality_provider.cc

Index: net/nqe/network_quality_provider.cc
diff --git a/net/nqe/network_quality_provider.cc b/net/nqe/network_quality_provider.cc
new file mode 100644
index 0000000000000000000000000000000000000000..030e0d8a7dc8d310303d0b2fc59eaef218dd216c
--- /dev/null
+++ b/net/nqe/network_quality_provider.cc
@@ -0,0 +1,23 @@
+// 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 "net/nqe/network_quality_provider.h"
+
+namespace net {
+
+base::Optional<base::TimeDelta> NetworkQualityProvider::GetHttpRTT() const {
+  return base::Optional<base::TimeDelta>();
+}
+
+base::Optional<base::TimeDelta> NetworkQualityProvider::GetTransportRTT()
+    const {
+  return base::Optional<base::TimeDelta>();
+}
+
+base::Optional<int32_t> NetworkQualityProvider::GetDownstreamThroughputKbps()
+    const {
+  return base::Optional<int32_t>();
+}
+
+}  // namespace net