Create a histogram serialization mechanism in components/metrics

base/metrics/crash_sample_chromeos.h

Index: base/metrics/crash_sample_chromeos.h
diff --git a/base/metrics/crash_sample_chromeos.h b/base/metrics/crash_sample_chromeos.h
new file mode 100644
index 0000000000000000000000000000000000000000..f177f8e9c481806d05650109bb5252c3fa3a1ec8
--- /dev/null
+++ b/base/metrics/crash_sample_chromeos.h
@@ -0,0 +1,30 @@
+// 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_CRASH_SAMPLE_CHROMEOS_H
+#define BASE_METRICS_CHROMEOS_CRASH_SAMPLE_CHROMEOS_H
+
+#include <string>
+
+#include "base/base_export.h"
+#include "base/compiler_specific.h"
+#include "base/metrics/metric_sample_chromeos.h"
+
+namespace base {
+// Represents 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 string ToString() const OVERRIDE;
+
+  // static
+  // Return a CrashSample object representing the serialized crash if possible.
+  // If the deserialization fails, returns NULL.
+  static CrashSample* ReadCrash(const std::string& crash_serialized);
+};
+}  // namespace base
+#endif  // BASE_METRICS_CHROMEOS_CRASH_SAMPLE_CHROMEOS_H