Added an option (-i) to have dump_syms output header information only.

src/common/linux/dump_symbols.h

 // -*- mode: c++ -*-
 
 // Copyright (c) 2011, Google Inc.
 // All rights reserved.
 //
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
@@ skipping 49 matching lines @@
 // or shared library, and write it to SYM_STREAM in the Breakpad symbol
 // file format.
 // If OBJ_FILE has been stripped but contains a .gnu_debuglink section,
 // then look for the debug file in DEBUG_DIRS.
 // SYMBOL_DATA allows limiting the type of symbol data written.
 bool WriteSymbolFile(const string &obj_file,
                      const std::vector<string>& debug_dirs,
                      const DumpOptions& options,
                      std::ostream &sym_stream);
 
+// Read the selected object file's debugging information, and write out the
+// header only to |stream|. Return true on success; if an error occurs, report
+// it and return false.
+bool WriteSymbolFileHeader(const string& obj_file,
+                           std::ostream &sym_stream);
+
 // As above, but simply return the debugging information in MODULE
 // instead of writing it to a stream. The caller owns the resulting
 // Module object and must delete it when finished.
 bool ReadSymbolData(const string& obj_file,
                     const std::vector<string>& debug_dirs,
                     const DumpOptions& options,
                     Module** module);
 
 }  // namespace google_breakpad
 
 #endif  // COMMON_LINUX_DUMP_SYMBOLS_H__