Create a histogram serialization mechanism in components/metrics

components/metrics/crash_sample_chromeos.cc

Index: components/metrics/crash_sample_chromeos.cc
diff --git a/components/metrics/crash_sample_chromeos.cc b/components/metrics/crash_sample_chromeos.cc
new file mode 100644
index 0000000000000000000000000000000000000000..330cb28f072a72e2146310edb3ecece8ad5df9c8
--- /dev/null
+++ b/components/metrics/crash_sample_chromeos.cc
@@ -0,0 +1,31 @@
+// 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/crash_sample_chromeos.h"
+
+#include <string>
+
+#include "base/strings/stringprintf.h"
+#include "components/metrics/metric_sample_chromeos.h"
+
+using base::StringPrintf;
+using std::string;
+
+namespace metrics {
+
+CrashSample::CrashSample(const std::string& crashname)
+    : MetricSample(MetricSample::CRASH, crashname) {}
+
+CrashSample::~CrashSample() {}
+
+string CrashSample::ToString() const {
+  return StringPrintf("crash%c%s%c", '\0', name().c_str(), '\0');
+}
+
+// static
+CrashSample* CrashSample::ReadCrash(const std::string& crashname) {
+  return new CrashSample(crashname);
+}
+
+}  // namespace metrics