Create a histogram serialization mechanism in components/metrics

components/metrics/export/crash_sample.h

Index: components/metrics/export/crash_sample.h
diff --git a/components/metrics/export/crash_sample.h b/components/metrics/export/crash_sample.h
new file mode 100644
index 0000000000000000000000000000000000000000..52b48419e158577f7e5236acd050937a703bfa7e
--- /dev/null
+++ b/components/metrics/export/crash_sample.h
@@ -0,0 +1,37 @@
+// 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.
+
+#ifndef COMPONENTS_METRICS_EXPORT_CRASH_SAMPLE_H_
+#define COMPONENTS_METRICS_EXPORT_CRASH_SAMPLE_H_
+
+#include <string>
+
+#include "base/base_export.h"
+#include "base/compiler_specific.h"
+#include "base/memory/scoped_ptr.h"
+#include "components/metrics/export/metric_sample.h"
+
+namespace metrics {
+
+// Represent a crash event described by a simple name.
+class BASE_EXPORT CrashSample : public MetricSample {
+ public:
+  explicit CrashSample(const std::string& crashname);
+  virtual ~CrashSample();
+
+  // Produce a serialized version of the crash.
+  // Format: crash\0|name_|\0
+  virtual std::string ToString() const OVERRIDE;
+
+  // Return a CrashSample object representing the serialized crash if possible.
+  // If the deserialization fails, returns NULL.
+  static scoped_ptr<CrashSample> ReadCrash(const std::string& crash_serialized);
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(CrashSample);
+};
+
+}  // namespace metrics
+
+#endif  // COMPONENTS_METRICS_EXPORT_CRASH_SAMPLE_H_