[test] Return target name on failures.

tools/testrunner/local/progress.py

 # Copyright 2012 the V8 project authors. 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
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@@ skipping 357 matching lines @@
       "stdout": test.output.stdout,
       "stderr": test.output.stderr,
       "exit_code": test.output.exit_code,
       "result": test.suite.GetOutcome(test),
       "expected": list(test.outcomes or ["PASS"]),
       "duration": test.duration,
 
       # TODO(machenbach): This stores only the global random seed from the
       # context and not possible overrides when using random-seed stress.
       "random_seed": self.random_seed,
+      "target_name": test.suite.shell(),

[Michael Achenbach, 2015/09/07 07:39:10]

shell name == target name is an approximation - but right now it's accurate I
think.

       "variant": test.variant,
     })
 
 
 PROGRESS_INDICATORS = {
   'verbose': VerboseProgressIndicator,
   'dots': DotsProgressIndicator,
   'color': ColorProgressIndicator,
   'mono': MonochromeProgressIndicator
 }