Add more information to about:version and "About Chromium" dialog

chrome/common/chrome_version_info.h

 // Copyright (c) 2011 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_CHROME_VERSION_INFO_H_
 #define CHROME_COMMON_CHROME_VERSION_INFO_H_
 #pragma once
 
 #include <string>
 
@@ skipping 19 matching lines @@
 
   // E.g. "Chromium" or "Google Chrome".
   std::string Name() const;
 
   // Version number, e.g. "6.0.490.1".
   std::string Version() const;
 
   // The SVN revision of this release.  E.g. "55800".
   std::string LastChange() const;
 
+  // OS type. E.g. "Windows", "Linux", "FreeBSD", ...
+  std::string OSType() const;
+
   // Whether this is an "official" release of the current Version():
   // whether knowing Version() is enough to completely determine what
   // LastChange() is.
   bool IsOfficialBuild() const;
 
  private:
 #if defined(OS_WIN) || defined(OS_MACOSX)
   scoped_ptr<FileVersionInfo> version_info_;
 #endif
 
   DISALLOW_COPY_AND_ASSIGN(VersionInfo);
 };
 
 }  // namespace chrome
 
 #endif  // CHROME_COMMON_CHROME_VERSION_INFO_H_