Create a histogram serialization mechanism in components/metrics

components/metrics/chromeos/serialization_utils.h

Index: components/metrics/chromeos/serialization_utils.h
diff --git a/components/metrics/chromeos/serialization_utils.h b/components/metrics/chromeos/serialization_utils.h
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index 0000000000000000000000000000000000000000..372e686c70f71e580a3f5283a70e0a67f0406ec1
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+++ b/components/metrics/chromeos/serialization_utils.h
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+// 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_CHROMEOS_SERIALIZATION_UTILS_H_
+#define COMPONENTS_METRICS_CHROMEOS_SERIALIZATION_UTILS_H_
+
+#include <string>
+
+#include "base/memory/scoped_ptr.h"
+#include "base/memory/scoped_vector.h"
+
+namespace metrics {
+
+class MetricSample;
+
+// Metrics helpers to serialize and deserialize metrics collected by
+// ChromeOS.
+namespace SerializationUtils {
+
+// Deserializes a sample passed as a string and return a sample.
+// The return value will either be a scoped_ptr to a Metric sample (if the
+// deserialization was successful) or a NULL scoped_ptr.
+scoped_ptr<MetricSample> ParseSample(const std::string& sample);
+
+// Reads all samples from a file and truncate the file when done.
+void ReadAndTruncateMetricsFromFile(const std::string& filename,
+                                    ScopedVector<MetricSample>* metrics);
+
+// Reads the next message from |file_descriptor| into |message|.
+//
+// |message| will be set to the empty string if no message could be read (EOF)
+// or the message was badly constructed.
+//
+// Returns false if no message can be read from this file anymore (EOF or
+// unrecoverable error).
+bool ReadMessage(int file_descriptor, std::string* message);
+
+// Serializes a sample and write it to filename.
+// The format for the message is:
+//  message_size, serialized_message
+// where
+//  * message_size is the total length of the message (message_size +
+//    serialized_message) on 4 bytes
+//  * serialized_message is the serialized version of sample (using ToString)
+//
+//  NB: the file will never leave the device so message_size will be written
+//  with the architecture's endianness.
+bool WriteMetricToFile(const MetricSample& sample, const std::string& filename);
+
+// Maximum length of a serialized message
+const int kMessageMaxLength = 1024;
+
+}  // namespace SerializationUtils
+}  // namespace metrics
+
+#endif  // COMPONENTS_METRICS_CHROMEOS_SERIALIZATION_UTILS_H_