Android perf runner: print the command line in the step itself.

build/android/pylib/perf/test_runner.py

 # Copyright 2013 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 """Runs a perf test on a single device.
 
 Our buildbot infrastructure requires each slave to run steps serially.
 This is sub-optimal for android, where these steps can run independently on
 multiple connected devices.
 
@@ skipping 54 matching lines @@
   Returns:
     exit code generated by the test step.
   """
   file_name = os.path.join(_OUTPUT_DIR, test_name)
   if not os.path.exists(file_name):
     logging.error('File not found %s', file_name)
     return 1
 
   with file(file_name, 'r') as f:
     persisted_result = pickle.loads(f.read())
+  logging.info('*' * 80)
+  logging.info('Output from:')
+  logging.info(persisted_result['cmd'])
+  logging.info('*' * 80)
   print persisted_result['output']
 
   return persisted_result['exit_code']
 
 
 class TestRunner(base_test_runner.BaseTestRunner):
   def __init__(self, test_options, device, tests, flaky_tests):
     """A TestRunner instance runs a perf test on a single device.
 
     Args:
@@ skipping 40 matching lines @@
       exit_code = 0
       result_type = base_test_result.ResultType.PASS
 
     persisted_result = {
         'name': test_name,
         'output': output,
         'exit_code': exit_code,
         'result_type': result_type,
         'total_time': (end_time - start_time).seconds,
         'device': self.device,
+        'cmd': cmd,
     }
     self._SaveResult(persisted_result)
 
     return (output, result_type)
 
   def RunTest(self, test_name):
     """Run a perf test on the device.
 
     Args:
       test_name: String to use for logging the test result.
 
     Returns:
       A tuple of (TestRunResults, retry).
     """
     output, result_type = self._LaunchPerfTest(test_name)
     results = base_test_result.TestRunResults()
     results.AddResult(base_test_result.BaseTestResult(test_name, result_type))
     retry = None
     if not results.DidRunPass():
       retry = test_name
     return results, retry