Add an optional root prefix to Linux dumpers

src/client/linux/minidump_writer/linux_core_dumper.cc

 // Copyright (c) 2012, 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 31 matching lines @@
 // To get register definitions.
 #include <asm/reg.h>
 #endif
 
 #include "common/linux/linux_libc_support.h"
 
 namespace google_breakpad {
 
 LinuxCoreDumper::LinuxCoreDumper(pid_t pid,
                                  const char* core_path,
-                                 const char* procfs_path)
-    : LinuxDumper(pid),
+                                 const char* procfs_path,
+                                 const char* root_prefix)
+    : LinuxDumper(pid, root_prefix),
       core_path_(core_path),
       procfs_path_(procfs_path),
       thread_infos_(&allocator_, 8) {
   assert(core_path_);
 }
 
 bool LinuxCoreDumper::BuildProcPath(char* path, pid_t pid,
                                     const char* node) const {
   if (!path || !node)
     return false;
@@ skipping 184 matching lines @@
       }
 #endif
     }
     note = note.GetNextNote();
   } while (note.IsValid());
 
   return true;
 }
 
 }  // namespace google_breakpad