Create a histogram serialization mechanism in components/metrics

components/metrics/metric_sample_chromeos.cc

+// Copyright 2014 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 "components/metrics/metric_sample_chromeos.h"
+
+#include <string>
+
+using std::string;
+
+namespace metrics {
+MetricSample::MetricSample(MetricSample::SampleType sample_type,

[Ben Chan, 2014/04/18 20:27:08]

nit: header calls it |type|, here it's called |sample_type|.

+                           const string& metric_name)
+    : type_(sample_type), name_(metric_name) {}
+
+MetricSample::~MetricSample() {}
+
+bool MetricSample::IsValid() const {
+  return name().find(' ') == string::npos && name().find('\0') == string::npos;
+}
+
+string MetricSample::ToString() const { return "not implemented"; }
+
+}  // namespace metrics