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

build/android/pylib/perf/test_runner.py

Index: build/android/pylib/perf/test_runner.py
diff --git a/build/android/pylib/perf/test_runner.py b/build/android/pylib/perf/test_runner.py
index bf09dfe00ee121af576fac779ef3421ebc78f0b5..bf265dac5a03d68677ba0a87025e0937051a44a4 100644
--- a/build/android/pylib/perf/test_runner.py
+++ b/build/android/pylib/perf/test_runner.py
@@ -72,6 +72,10 @@ def PrintTestOutput(test_name):
 
   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']
@@ -132,6 +136,7 @@ class TestRunner(base_test_runner.BaseTestRunner):
         'result_type': result_type,
         'total_time': (end_time - start_time).seconds,
         'device': self.device,
+        'cmd': cmd,
     }
     self._SaveResult(persisted_result)