Create a histogram serialization mechanism in components/metrics

base/metrics/metric_sample.h

Index: base/metrics/metric_sample.h
diff --git a/base/metrics/metric_sample.h b/base/metrics/metric_sample.h
new file mode 100644
index 0000000000000000000000000000000000000000..3c5e7e222bbe782ccc340460b4244a43cf7cb35c
--- /dev/null
+++ b/base/metrics/metric_sample.h
@@ -0,0 +1,27 @@
+// 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_METRIC_SAMPLE_H_
+# define BASE_METRICS_METRIC_SAMPLE_H_
+
+#include "base/base_export.h"
+
+namespace base {
+class BASE_EXPORT MetricSample {
+ public:
+  enum SampleType {
+    CRASH,
+    HISTOGRAM,
+    LINEAR_HISTOGRAM,
+    SPARSE_HISTOGRAM,
+    USER_ACTION
+  };
+  explicit MetricSample(SampleType t);
+  virtual ~MetricSample();
+  virtual int Write(int buffer_size, char* buffer);
+  SampleType type;
+  SampleType getType();

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

name() for accessor and name_. The variable also shouldn't be public if you have
an accessor.

+};
+}  // namespace base
+# endif  // BASE_METRICS_METRIC_SAMPLE_H_