[Cronet] Pass metrics information from C++ BidirectionalStream to Java

components/cronet/android/metrics_util.h

+// Copyright 2016 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 COMPONENTS_CRONET_ANDROID_CRONET_METRICS_UTIL_H_
+#define COMPONENTS_CRONET_ANDROID_CRONET_METRICS_UTIL_H_
+
+#include <stdint.h>
+
+#include "base/time/time.h"
+
+namespace cronet {
+
+class MetricsUtil {

[mgersh, 2016/10/05 19:36:47]

This should be a namespace instead of a class:
https://google.github.io/styleguide/cppguide.html#Nonmember,_Static_Member,_a...

[xunjieli, 2016/10/06 03:51:47]

Done. Good to know!

+ public:
+  // Converts timing metrics stored as TimeTicks into the format expected by the
+  // Java layer: ms since Unix epoch, or -1 for null
+  static int64_t ConvertTime(const base::TimeTicks& ticks,
+                             const base::TimeTicks& start_ticks,
+                             const base::Time& start_time);
+};
+
+}  // namespace cronet
+
+#endif  // COMPONENTS_CRONET_ANDROID_CRONET_METRICS_UTIL_H_