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..8213d966391595f220cbdb7eb143fe103d2f5e9c
--- /dev/null
+++ b/net/base/network_quality.cc
@@ -0,0 +1,47 @@
+// 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 {
+
+// If two double values are within |kDelta| of each other, they are assumed to
+// be equal.
+const double kDelta = 0.001;
+
+}  // namespace
+
+namespace net {
+
+NetworkQuality::NetworkQuality(const base::TimeDelta& rtt,
+                               double rtt_confidence,
+                               uint64_t throughput_kbps,
+                               double throughput_kbps_confidence)
+    : rtt_(rtt),
+      rtt_confidence_(rtt_confidence),
+      throughput_kbps_(throughput_kbps),
+      throughput_kbps_confidence_(throughput_kbps_confidence) {
+  DCHECK_GE(rtt_, base::TimeDelta());
+  DCHECK_GE(rtt_confidence_, 0 - kDelta);
+  DCHECK_LE(rtt_confidence_, 1 + kDelta);
+
+  DCHECK_GE(throughput_kbps_, 0U);
+  DCHECK_GE(throughput_kbps_confidence_, 0 - kDelta);
+  DCHECK_LE(throughput_kbps_confidence_, 1 + kDelta);
+}
+
+NetworkQuality::~NetworkQuality() {
+}
+
+base::TimeDelta NetworkQuality::GetRtt() const {

[bengr, 2015/06/05 20:44:13]

Inline this simply as rtt()

[tbansal1, 2015/06/05 23:45:56]

Done.

+  return rtt_;
+}
+
+uint64_t NetworkQuality::GetThroughputKbps() const {

[bengr, 2015/06/05 20:44:13]

Inline and rename downlink_throughput_kpps(). Rename the member variable as
well. Return an int32_t.

[tbansal1, 2015/06/05 23:45:56]

Done. Will change to int32_t in next CL. Added TODO.

+  return throughput_kbps_;
+}
+
+}  // namespace net