Create a histogram serialization mechanism in components/metrics

base/metrics/crash_sample_chromeos.cc

Index: base/metrics/crash_sample_chromeos.cc
diff --git a/base/metrics/crash_sample_chromeos.cc b/base/metrics/crash_sample_chromeos.cc
new file mode 100644
index 0000000000000000000000000000000000000000..d82a8fd684b244e0251e4e7c5d21afea30da1028
--- /dev/null
+++ b/base/metrics/crash_sample_chromeos.cc
@@ -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.
+
+#include "base/metrics/crash_sample_chromeos.h"
+
+#include <string>
+
+#include "base/metrics/metric_sample_chromeos.h"
+#include "base/strings/stringprintf.h"
+
+using std::string;
+
+namespace base {
+CrashSample::CrashSample(const std::string& crashname)
+    : MetricSample(MetricSample::CRASH, crashname) {}
+
+CrashSample* CrashSample::ReadCrash(const std::string& crashname) {
+  return new CrashSample(crashname);
+}
+
+CrashSample::~CrashSample() {}
+
+string CrashSample::ToString() const {
+  return StringPrintf("crash%c%s%c", '\0', name_.c_str(), '\0');
+}
+}  // namespace base