Metrics log modification to handle external components.

chrome/common/metrics/version_utils.h

+// Copyright 2015 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 CHROME_COMMON_METRICS_VERSION_UTILS_H_
+#define CHROME_COMMON_METRICS_VERSION_UTILS_H_
+
+#include <string>
+
+#include "chrome/common/chrome_version_info.h"
+#include "components/metrics/proto/system_profile.pb.h"
+
+namespace metrics {
+
+// Build a string including the Chrome app version, suffixed by "-64" on 64-bit
+// platforms, and "-devel" on developer builds.
+std::string GetVersionString();
+
+// Translates chrome::VersionInfo::Channel to the equivalent
+// SystemProfileProto::Channel.
+SystemProfileProto::Channel AsProtobufChannel(
+    chrome::VersionInfo::Channel channel);
+
+}  // namespace metrics
+
+#endif  // CHROME_COMMON_METRICS_VERSION_UTILS_H_