Create a histogram serialization mechanism in components/metrics

base/metrics/useraction_sample.h

+// Copyright (c) 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.
+
+# ifndef BASE_METRICS_CHROMEOS_USERACTION_SAMPLE_H
+# define BASE_METRICS_CHROMEOS_USERACTION_SAMPLE_H
+
+#include <string>
+
+#include "base/base_export.h"
+

[achaulk, 2014/04/07 22:16:00]

No spacing here

+#include "base/metrics/metric_sample.h"
+
+namespace base {
+class BASE_EXPORT UserActionSample: public MetricSample {
+ public:
+  explicit UserActionSample(const std::string& action);
+  virtual ~UserActionSample();
+  std::string getAction();
+  int Write(int buffer_size, char* buffer);
+  // static
+  static UserActionSample* ReadUserAction(const std::string& message);
+ private:
+  std::string action;
+};
+}  // namespace base
+# endif  // BASE_METRICS_CHROMEOS_USERACTION_SAMPLE_H