Add GPU fingerprint information to breakpad microdumps.

src/client/linux/microdump_writer/microdump_writer.h

 // Copyright (c) 2014, 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
 // notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
@@ skipping 39 matching lines @@
 //     build fingerprint (e.g., aosp/occam/mako:5.1.1/LMY47W/1234:eng/dev-keys).
 //   product_info: a (optional) C string which determines the product name and
 //     version (e.g., WebView:42.0.2311.136).
 //
 // Returns true iff successful.
 bool WriteMicrodump(pid_t crashing_process,
                     const void* blob,
                     size_t blob_size,
                     const MappingList& mappings,
                     const char* build_fingerprint,
-                    const char* product_info);
+                    const char* product_info,
+                    const char* gpu_fingerprint);
 
 }  // namespace google_breakpad
 
 #endif  // CLIENT_LINUX_MINIDUMP_WRITER_MICRODUMP_WRITER_H_