webkitpy: Replace errors when decoding input.

third_party/WebKit/Tools/Scripts/webkitpy/common/system/executive.py

 # Copyright (c) 2009, Google Inc. All rights reserved.
 # Copyright (c) 2009 Apple 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 373 matching lines @@
                              stdin=stdin,
                              stdout=self.PIPE,
                              stderr=stderr,
                              cwd=cwd,
                              env=env,
                              close_fds=self._should_close_fds())
         output = process.communicate(string_to_communicate)[0]
 
         # run_command automatically decodes to unicode() unless explicitly told not to.
         if decode_output:
-            output = output.decode(self._child_process_encoding())
+            output = output.decode(self._child_process_encoding(), errors="replace")
 
         # wait() is not threadsafe and can throw OSError due to:
         # http://bugs.python.org/issue1731717
         exit_code = process.wait()
 
         if debug_logging:
             _log.debug('"%s" took %.2fs' % (self.command_for_printing(args), time.time() - start_time))
 
         if return_exit_code:
             return exit_code
@@ skipping 73 matching lines @@
             pool.close()
             pool.join()
 
 
 def _run_command_thunk(cmd_line_and_cwd):
     # Note that this needs to be a bare module (and hence Picklable) method to work with multiprocessing.Pool.
     (cmd_line, cwd) = cmd_line_and_cwd
     proc = subprocess.Popen(cmd_line, cwd=cwd, stdout=subprocess.PIPE, stderr=subprocess.PIPE)
     stdout, stderr = proc.communicate()
     return (proc.returncode, stdout, stderr)