Store network quality samples so we can compute percentiles.

net/base/network_quality.cc

Index: net/base/network_quality.cc
diff --git a/net/base/network_quality.cc b/net/base/network_quality.cc
new file mode 100644
index 0000000000000000000000000000000000000000..a1a1ee04a1b2b0da88258fb99e0060fd72bce00e
--- /dev/null
+++ b/net/base/network_quality.cc
@@ -0,0 +1,21 @@
+// Copyright 2015 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/base/network_quality.h"
+
+#include "base/logging.h"
+
+namespace net {
+
+NetworkQuality::NetworkQuality(const base::TimeDelta& rtt,
+                               int32_t downstream_throughput_kbps)
+    : rtt_(rtt), downstream_throughput_kbps_(downstream_throughput_kbps) {
+  DCHECK_GE(rtt_, base::TimeDelta());
+  DCHECK_GE(downstream_throughput_kbps_, 0);
+}
+
+NetworkQuality::~NetworkQuality() {
+}
+
+}  // namespace net